To be honest I have never had any problems with XP or Vista, however, I always read posts from people who do.
In my opinion the spec of the computer is a BIG issue when it comes to operating systems and although they are built to run on a minimum spec I have found there are far less problems when using a decent machine, I have 4gb of memory and an Intel core 2 processor and can honestly say I have not had any problems with Vista.
How you look after your system and general PC competence are also a big issue, obviously accidentally deleting an imortant system file is going to cause problems
