Need to Upgrade from Corel Draw 12 on Windows 7 64 bit

I am using Corel Draw 12 on Windows 7 64 bit laptop.  The laptop is unable to use virtual mode XP.  Daily,  issues are increasing using CD 12, and obviously it is getting frustrating.  As to upgrades, I need to know which version, X4 or X5, has the fewest issues on Win. 7 64 bit.  Thanks

Barbara Douglas