I am thinking of upgrading my PC. What parts should I buy? I currently have an old one from 2000. So probably need to upgrade every component? Probably best to buy a whole new box (with all new components)? Currently I have 731MHz, 128MB and 20Gigs. If you want an upgrade on hard drive space but would like to keep your old files, how would you do it? I like to have an upgrade but keep all the current settings, programs, files etc.