right , in theory my PC should be fairly quick and is but every so often something slows it down completely for up to a min , sometimes more this can happen just browsing with firefox / running games can often freeze for a second / running "burn in test" takes about 4 mins to start up !!!

its as though the CPU usage is at 100% for a bit but it isnt

main specs are :
4GB ddr3 ram / OC'd to 1600
AMD phenom II quad core (3.2)
NVIDIA GeForce GTX 460 1024 MB / ddr5
2 HDD's -
1 x 60 GB SSD drive as operating system drive
1 x 1TB "spinpoint" storage drive
XP SP3 with most of the animations and stuff disabled etc

I'm beginning to think the SSD OS disc might be bottle necking but this is barely more than a (slightly) educated guess

any help would be greatly appreciated