Corel Draw X3 Freezes in Vista & Windows 7

I previously had Vista  & now have Windows 7, but I am still experiencing the same problem. (Even after installing on a new laptop w an Intel core I5, 8GB of ram & a 1GB video card)  After a few min working in X3 all graphics on the screen disappear.( happens in Vista & 7) The page is still there & I can still save what I am working on but I have to close out & reopen that file.

I don't have this problem with any of the computers @ my shop, but of course all of the PC's there are running XP.

Is there any fix for this problem or am I gonna have to shell out to upgrade all 6 of my computers @ work to X4 or X5????

Any suggestions?

Thanks in advance