I'm pretty sure there's something wrong with your PC's hardware settings (e.g., something in your BIOS, etc.) OR some piece of software is gobbling up your CPU time, RAM, memory bandwidth, etc.

http://www.futuremark.com/download/pcmark05/

http://www.sisoftware.co.uk/index.ht...64&langx=en&a=

Run PCMark2005 and some benchmarks from the SiSoft Sandra Suite, such as the Memory Bandwidth test, CPU test, hard drive benchmark, and maybe a couple of others if they seem pertinent.

Post your benchmarks. Something's definitely up.