HELP! Computer performs certain actions very slowly

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A couple of months ago I went away for the weekend. Computer was working fine before I left. When I came back I switched the computer on and it took about 20 minutes to start up (before it took less than 5 minutes). I thought maybe it was just a one off, but it happened again and again. Additionally, the computer would hang whenever I tried installing/opening a program, which requires UAC. To solve this I went into safe mode and changed these settings to make it less strict. Now it doesn't hang anymore, but it still takes a long time to load up the application and windows boot is as slow as ever.

I've been writing my dissertation, so I didn't want to fiddle around with the computer too much in case something goes wrong, so I've just put up with it until now.

Here's a list of the things I've tried to solve the problem:

- CCleaner and registry clean
- Disable automatically running unnecessary programs on start up
- Virus scan
- Disk cleanup
- Disk defrag
- Disk check
- sfc/scannow
- increasing partition size of my C-drive (currently 27% free)
- Malwarebytes scan
- DriverUpdate
- FixCleaner

I have 4GB RAM, 40-60% of it is generally in use. CPU (AMD Phenom II X4 955 Processor 3.20GHz) usage doesn't exceed 10%. My OS is Windows 7 Home Premium 64bit.

I'll be happy to hear any ideas of how I could diagnose and/or fix this without having reinstalling windows. Thanks.
 
Hello, two machines ( laptops) did this to me one of which still does it, even with a fresh install of windows, which seems to point towards hard drive again.

My personal laptop did what you describe twice, althrough the first time it took a long while for it to blow up so to speck..I than got a replacement drive it done it literally as you tell it. Lucky I had all the drivers and my work on external

I turned it off the night before, to sleep next day home from work and well you know the rest...

In my case it was the hard drive, both times or should I say three, this may not be the case for you. However due to dajavu issues you got I would certainly back up to be safe. I would recommend due to what you done has not solved the issue is to go back to a blank page as it were. to knock out all possibles of software issues.

Get the hard drives dio tools and run it see if it spins up fine etc.
 
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How old is the PC - sounds like hardware starting to fail, probably the HDD.

Switch on SMART monitoring for the hard drive and also run MEMTEST on your RAM.
 
Do you have another HDD as part of your build with another operating system on it? I've seen this many times as part of a dual boot. Windows updates, but it causes a conflict with drivers etc and the poor PC gets very confused.
 
The PC is just over 2 years old. My internal hard drive is divided into two partitions (one with my programs, one with my data), otherwise the only other hard drive is my external one. I guess I'll back everything up first (most of it already is) and look at the MEMTEST and SMART monitoring. If I still get no joy, then I guess a clean install is the only option.
 
Better off just having a single partition, never seen the point in splitting up a HDD for that.

Do you have another HDD as part of your build with another operating system on it? I've seen this many times as part of a dual boot. Windows updates, but it causes a conflict with drivers etc and the poor PC gets very confused.

Partitions be affected this way, besides the dual boot?
 
Better off just having a single partition, never seen the point in splitting up a HDD for that.



Partitions be affected this way, besides the dual boot?

Sorry I don't understand the question. I decided to make two partitions because I thought it would keep things more organised, particularly in splitting my program files from my data files. It also means if I want to do a clean install, I can theoretically do it without touching my data drive.
 
I had to take my computer apart a bit because of a problem with my CD Drive. I noticed that it's become very dusty over the past 2 years so I cleaned the parts I could get to without taking everything apart (I'm still just a novice when it comes to assembling a computer). This seems to have shortened the start-up time by about half. Now it takes about 10 minutes. Could it be that the accumulation of dust is the sole reason for my computer's lack of performance? I ran DiskCheckup (SMART monitoring) and it's showing no faults with my HDD. Will try MEMTEST86+ at some point today.
 
MEMTEST86+ showed no problems. I then updated DiskCheckup and ran the Disk Selt Test, which claims that there's a "read element" failure with the HDD. I have a Western Digital HDD and just googling the problems shows that read element failure is actually quite common with WD. Is it likely that this is the cause of my computers sporadically slow performance speeds?
 
sounds like HDD,clean install is the only way your going to tell.there are ways to tell whats slowing down your boot time but your going to need to google that(too much to explain!) registry cleaners are never a good idea.they often make more problems than fixes!!
 
I downloaded the WD Data Lifeguard Diagnostic, which is designed to check the functionality of specific WD drives. The quick test firstly showed the same results (read element failure). I then tried the extended test and after 6 hours it stopped saying Error "08 - Too many bad sectors detected." I then tried the quick test again and it passed...

Test Option: EXTENDED TEST
Model Number: WDC WD15EARS-00Z5B1
Unit Serial Number: WD-WMAVU1573818
Firmware Number: 80.00A80
Capacity: 1500.30 GB
SMART Status: PASS
Test Result: FAIL
Test Error Code: 08-Too many bad sectors detected.
Test Time: 09:30:27, April 07, 2013

Test Option: QUICK TEST
Model Number: WDC WD15EARS-00Z5B1
Unit Serial Number: WD-WMAVU1573818
Firmware Number: 80.00A80
Capacity: 1500.30 GB
SMART Status: PASS
Test Result: PASS
Test Time: 13:41:35, April 07, 2013

How can this be explained?
 
I had the same issue with my Samsung - would report ok on scans then wouldn't. RMA'd it as it turned out bad. Your HD looks like it has physically bad sectors these will increase in number quite rapidly. Backup and get another one.
 
Just to emphasise physical bad sectors can be marked as bad by an OS and subsequently avoided however that won't halt further deteriation and thus more bad sectors from occuring.
 
Unfortunately my warranty has ran out on this HDD (just a couple of months ago in fact). I have backed everything up on my external hard drive and important work is on a USB stick so I'd say I'm well covered. I guess the question now is, what is the best kind of hard drive to get. After this experience I don't fancy going with WD again.
 
Unfortunately my warranty has ran out on this HDD (just a couple of months ago in fact). I have backed everything up on my external hard drive and important work is on a USB stick so I'd say I'm well covered. I guess the question now is, what is the best kind of hard drive to get. After this experience I don't fancy going with WD again.

Well I wouldn't personally be put off of a manufacturer because of failure outside warranty. These are wear and tear items after all and I personally rate WD drives as among some of the best. These kind of failures emphasise the need to backup which you've done.

If you can afford it get a high capacity SSD, alternatively a smaller SSD for OS and frequently used programs and another mechanical drive too.
 
One thought that's just occurred to me. The warranty ran out on 31st January and these problems started on 3rd February. Am I being cynical in thinking this is more than just a coincidence?
 
WD gave me the most RMA ever
But i have not purchased any hard drives in the last 3 years
I find WD faulty from the purchase date and send it back so never lost data on main drive
 
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