how hard is it to do? is it as simple as putting in the disk and sitting back and waiting? I have windows XP, i'm not sure what the hell to do, but I know this computer needs a reformat badly. I have an external harddrive, if I put everything I want from my harddrive on the computer to the external, will I lose any of it? or will it be completely safe? also, I have an "aftermarket" video card, do I have to do anything special to that when reformatting? my friend once told me that you had to take the new one out, put the old one in, reformat, update drivers, then put the new one back in.. ... thanks for any help, i'm a complete idiot on this shit, lol.