You need to ascertain whether this is the cause of an unstable overclock or a software problem.
My money is on software but better safe than sorry.. stress using whatever takes your fancy - Prime95 on 8 threads would be ideal.
As IE9 crashes on boot every time, over two seperate installs of a different OS, it would seem likely to me that there's a problem with the config on the machine. Have you changed registry settings to put programs on a different partition/drive by any chance? If so, have you copied all the default programs and files to the new location?
Let me know how this gets on, keen to hear the outcome.
I Havnt done any overclock, I only have a c drive with everthing installed in default directories on the c drive. i have not carried out any registry tweaks. I do not have any viruses on the system, AVG installed before anything else.
I have installed SP1 for windows 7 (64 bit) and any other updates, Just seems strange that apps are crashing the first time i go in them such as sage accounts or IE9 or BF3 but then generally work afterwards. I tried installing Sage Act but it requires sql express and I am finding the the Sql Express install is failing when it trys to start the Sql browser service. Cant understand why windows 7 and Chrome seems so stable but apps are crashing out.
Can you suggest a good hardware diagnostics that tests the motherboard and memory as I am beginning to suspect them.