I have a iMAC PowerPC G3 512MB OS X Version 10.1.4. I recently upgraded from Virtual PC 3.0 to Virtual PC 5.0. Problem is that that I can't do any thing in Virtual PC. Even opening My Computer window takes more than a minute. I have increased memory allocated to Virtual PC to 256 MB but it didn't make any difference. Under Mac OS 9.2, when I wanted to increase speed of virtual PC, I would increase memory assigned to it and it would make a huge difference. Doesn't seem to work under OS X. Any suggestions? Thanks!