its most probably memory thing, u might wana increase ur ram

yea..it has to be about ram....or your graphics card

i dont think is about graphix card.. just add some more ram... and it should work..
ask again if it doesnt work

The cheapest thing to try is to find out if your laptop is overheating, if your laptop is over a year old or you have any pets, cat, dog, woolly mammoth, then i would have a look at cleaning out the dust/hair. Have a quick search on google for the safest way to do this.

Try to keep the laptop on a desk if possible, I know thats sort of defeating the point of owning a laptop but resting it on legs/bed can cause them to overheat.

Finally have a look at updating any drivers, the lastest can usually be found on the laptop manufacturers website.

Like the other guys have pointed out, it could be a hardware faliure somewhere and unless its still cover by a warrenty laptops can be expensive to get sorted.

Rich

thnx man i will try all these
thnx for ur help

Well I had a problem once exactly like that where my computer would randomly freeze (especially when doing something media related) and it turned out to be a hard disk problem and I ended up getting it replaced (and loosing all the data that I had not backed up- fortunately I had all the very important stuff backed) I can only wish that I had backed more up... If you experience an increased amount of freezing then you should consider backing some stuff up just incase.

I could be wrong, it could be memory, gl in sorting out the problem.