CorelDraw X8 install and run problem

I have 5 reg copies of CD X8, 4 have installed and run on 4 PCs no problem 5th PC program installs fine, at the end asks me to sign into my account and add password, once I click continue program disappears, click on restart X8 same thing, also happens with CorelPaint, font manager, won't allow the program to run. I have uninstalled, reinstalled, done 2 system restores and tried reinstalling, even tried 2 ghost images putting the PC back to 1 month ago but still same problem when installing. Pc has run X4 and X6 no problems in the past as have the other 4 PCs. Have disabled Symantec AV, and windows firewall when installing - any ideas on this problem?