i would stay away from 64bit untill vista comes out as xp 64 is the biggest joke ever and 32 bit on 64 from waht iv herd wont work that well. if you do go for a 64 one id get linux as that is very secure and stable and has been 64bit for a long time. try summin like suse click here or debian click here as these are the easier to pick up. linux is also totaly free(exept linspire)!!!!! as for processors id go for a amd one not intel as intel are suseptable to virus atack and the amd chip are more secure from that perspective and amds are cheaper to. if you want a good cheap one try amd sempron as they run great and are realy cheap as they are bujet chips but still pack a punch as iv found out. i run doom3 on max grafics on 1.8 ghz one! but id save your mony and get linux and a pc minus windoz from a pc fair as they tend to be much cheaper than pcworld ect.