I have both running in xp sp3. My first thought in win7 was that might be the problem so I removed 12 and then reinstalled x4 but no help.
Installed the various upgrade patches but no help.
The only indication I get that 7 sees it is when I go to uninstall it shows that however many times I tried to run it are running and must be closed before I can uninstall. These are not visible in task manager so I have to do a forced shutdown and then uninstall.