[Chronic Diarrhea]

sounds like you do have a pretty efficient system if you do get rid of those .bak, .tmp, etc. files from your hard drive. Also I would recommend you get rid of unnecessary .jpg, .bmp, and .chk files as well. You would be suprised to see how much space unnecessary .jpg and .bmp files are on your hard drive. I got rid of many of those and it sped up my system a ton. Other than that I regularly defrag but that doesn't improve the performance much. I get rid of files in my temp folder too after it gets clogged up.