Hello!
No, mean it has to be something to do with Vista, not the PC. Like I say, and almost identical machine running XP is just fine.
I have one hard drive 7200rpm jobbie. Vista is the Premuim version and is fully up to date. The motherboard is an intel P35. Overall I get Vista performance figures of CPU 5.6, RAM 5.9, Graphics 5.9, Disk 5.3