I am upgrading my system switching from an Epox 8KTA3 mobo with 1.0 G Athlon to an MSI KT3Ultra2 board with an Athlon 2000+ CPU. I am currently running Windows XP Home Edition. My question is - - do I have to reformat the HD and do a clean install of XP and all applications, or can I just reinstall XP and overwrite the current installation. I would prefer to do the latter, but I am told that I might have problems if I don't wipe the HD clean and start from scratch. Any advice would be appreciated.