If you have issues with a program check its website or Google the program's name, version number and your version of Windows to see if there are any issues with it.

Avoid installing system software not listed as compatible with your version of Windows, otherwise try installing it as normal; if it fails, Windows 7 may offer to apply compatibility settings to it – see if these work.

If the program installs but won't run, right-click its program shortcut and choose Properties > Compatibility Settings. Select your old version of Windows from the list and click OK.

If this fails, try ticking "Run this program as an administrator"; in Windows 7 you can also click "Help me choose the settings" to gain access to the Program Compatibility Troubleshooter.