I've got a PC World PC, and ive never really been happy.
The first one I bought I returned after it was shit slow on games and kinda hung on Winamp, its a P4 1.4 FFS! I rang their helpline and they said to Ctrl+Alt+Del and close every program(except Explorer) to run games, something that you really shouldn't if you want your PC to survive.
The next one I got is more stable and can cope, but it crashes frequently and my pop wants to take it in for a "Health-check." And yes, I've already told him they just run scandisk and defrag it..... Oh well.
I'm buying my own PC soon and am going to head for Evesham or Dell i think. Anyone got some other suggestions for computer companies that make custom PC's and have a good reputation. MESH and Viglen both seem a bit fify from what friends have told me.