win xp crashes

I have a question,
I had some software..beta..after contacting support it was decided it was'nt the software causing my problem!

I can get as many as 8 crashes in a row , some days 1 or 2 any idea's ?? seems to happen while flicking from one screen to another.

Sometimes it does'nt manage to load, its win xp we have all the "hot fixes" we get win updates regular.

I can be in the middle of something, maybe a pm to someone, maybe doing a post, i can't "alt-ctrl-delete, the mouse freezes everything, this happened here yesterday.

What is the software?

Swish

The Swishlite and Swish2 work like a dream, the max i tried but kept getting crashes all the time.

I asked support and between us we felt it was'nt the software but the machine.

I was advised by support to update all drivers, but as its not my machine i have to get the owner to do that, i asked today and he said he'll format next week, put winxp home on instead of the xp professional...may make a difference.