The great thing is, you can install it even if it's got spyware, then have Ad-Aware tell you if there's any spyware in it.

If it has spyware, you can deinstall it and then use Ad-Aware to make sure the spyware is cleaned off.

Alternatively, if it has one of the more common pieces of spyware such as CyDoor, you can use a "dummy DLL" to replace the real CyDoor DLL and the software will work just fine, but with the spyware neutered.