I want to install xp pro over my xp home as the home software is freezing,
windows explorer keeps shutting down... Can I do this and repair the os?
There are two questions here:
1. Can you upgrade from XP Home to XP Professional?
Yes, you can. However note that you need a retail copy (Full or
Upgrade) of XP Professional to do any upgrade. An OEM copy will not
work.
2. Is upgrading from Home to Professional a good approach to trying to
solve your freezing/shutting down problems?
No, it's not. It's highly unlikely that upgrading will solve the
problem, and it may very well make the problem worse. The one time I
always recommend *against* doing an upgrade is when you are
experiencing problems.