Typing out in capital letters will cause people to ignore you. This is a common rule of thumb you should be aware of when running to a forum for help.
From what I can deduce, this sounds more like a software problem other than a hardware problem. I suspect that there may be a program running in memory deliberatly slowing things down. But, rather not trust my opinion. Wait for somebody else to agree with me before you trust me
-------------------------
AMD Phenom II 1100T x6 Black Edition Processor
Apacer 8GB 1333Mhz DDR3 RAM
Nvidia GT240 (1GB GDDR5 VRAM)
MSI 785GM -E51 motherboard
720W Gigabyte PSU
500GB Seagate 7200rpm HDD
Windows 7 Ultimate 64-bit / Ubuntu 11.04 64-bit