You should use the Compatibility settings:
Right-click on the Conquest icon, select Properties and click on the Compatibility tab.
http://windowshelp.microsoft.com/Windows/en-US/help/bf416877-c83f-4476-a3da-8ec98dcf5f101033.mspx
If you give us an idea of what isn't working, we can help with specific settings.
Good luck!
pax,
-Chris