Can I install XP professional over existing XP Home?

[Birds nest]

It is possible to upgrade home to pro. but i would just leave it as it is. What do you need pro for?

[Evighet]

If you want to install a new version of windows over an old version, make sure all the files you want to keep are moved out of the "Documents and Settings" and the "WINDOWS" folders. You should be fine. You might also want to get out your application CD's unless you have a way to keep programs listed in your registry. Some need a registry entry to work.

-Evighet

[kmanoj]

I strongly recommend going for windows 2000 instead of XP. I removed Xp and loaded win 2k for a lot of friends and they are very happy about it. Even their gaming is not affected, they play a lot of counterstrike :)