Locks up the whole system, requiring you to restart the machine?
Then you're looking at hardware problems, or a bug in a low level driver.
Start by updating your video card driver from the GPU maker's website (not Microsoft and not the system builder).
Thanks for the reply Chris but it only locks up photoshop not my system... It may be a video card issue tho as I just updated it...
Yes, it could easily be a video driver issue.
Chris the video card update I did the other day must have been the issue as I went and manually did another update from the AMD site and everything is working now...
Thanks for the help...