I've had PCs for as long as they've been around. I've not had more than a handful of problems ever.
While I hate Windows Vista with every fiber of my being, I've not had any real problems with it. It's a clunky piece of crap but it keeps alive the Microsoft streak of "every other OS we release will totally piss you off".
Macs definitely rock when it comes to video editing/etc but I don't do any of that so I'd never spend the extra coin. If you buy a PC, make sure you buy good virus/malware/spyware protection, a good cleaner program like Window Washer, turn off automatic updates (do them manually) and stay away from Internet Explorer. If you do those things and aren't an abject moron, it's quite likely you won't have any of the nightmare issues that "supposedly" plague Windows PCs.