3 weeks ago I built myself a new computer, and all has been fine for that time, until yesterday. I was playing Fallout 3, was running smoothly as normal, when suddenly my PC just randomly reset, no BSOD or anything. Since then, it's been running much slower than usual. Boot up is a lot slower, and games especially, for example loading my save in Fallout 3 has gone from 20 seconds to about 2 minutes, and loading a map in Battlefield 2 about the same. It seems to be slowest after a fresh boot up in the morning (difficult to say for definate though because it happened yesterday), so the loading time in games will be the 2 minutes, and then after the first load of whatever it is, it seems to be back to normal, however it is still a lot slower than usual. I'm also noticing frequent stuttering and constant lockups in Fallout 3 that I never had before. Also, I ran a disk check, and at stage 4 (verifying file data) is went at snails pace, getting to 8% after 1 1/2 hours. This is what I upgraded to - Intel Core 2 Quad Q6600 G0 Stepping (2.4GHz 1066MHz) Socket 775 L2 8MB Cache (2x4MB (4MB per core pair) Retail Boxed Processor Corsair 4GB Kit (2x2GB) DDR2 800MHz/PC2-6400 XMS2 Memory Non-ECC Unbuffered CL5 Lifetime Warranty Gigabyte GA-EP43-S3L iP43 Socket 775 8 channel audio ATX Motherboard XFX HD 4870 1GB GDDR5 Dual DVI HDTV Out PCI-E Graphics Card OCZ Stealth XStream 600W PSU - SLI Ready ATX2.2 12cm Fan Some help please!