Upgrading my system

[NotoriousHJM]

I'm thinking of upgrading my Pc and I just need some Hardware support really.


Operating System: Windows Vista™ Home Premium (6.0, Build 6002) Service Pack 2 (6002.vistasp2_gdr.100218-0019)
Language: English (Regional Setting: English)
System Manufacturer: NVIDIA
System Model: NVDAACPI
BIOS: Phoenix - AwardBIOS v6.00PG
Processor: Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz (2 CPUs), ~2.4GHz
Memory: 2046MB RAM
Page File: 1509MB used, 2827MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
DxDiag Version: 7.00.6002.18107 32bit Unicode
Card name: NVIDIA GeForce 8800 GTX
Manufacturer: NVIDIA
Chip type: GeForce 8800 GTX


Are my current specs.
I'm a gamer and I edit a lot of video so really having my amount of RAM isn't sufficient atm.
I was thinking of installing Windows 7 64 bit and pumping my Memory up to 6gb.

I have no idea about Hardware though and I'd gladly appreciate it if someone could point out some decent Memory for me?
I have a budget of about £100 for memory. Thanks

 

[NotoriousHJM]

I'm kind of a novice when It comes to overclocking etc.
Recently I set my fans to work on overdrive so now my PC is ridiculously loud and I have no idea how to reset them to default haha but anyway.

Thanks for the rapid reply first off.
My Motherboard is:

I can probably push the price for RAM to about £150 too.

 

[NotoriousHJM]

Ill do a CMOS Reset!

 

[NotoriousHJM]

Ok My RAM is Corsair XM52 DDR2 MEA 800 MHZ I migh've got a bit wrong then As I wrote it down quite sloppily.
Anyway, What Ram could you recommend to accompany that or Should I just get brand new sticks to replace it?