I have Acrobat Pro 6 and it says that it is not compatible with my new version of windows 8
Probably right. Acrobat 6 will be 10 years old next year. I'd be surprised if it runs on Win 8.
Might be time to upgrade to Acrobat XI.
What John said. Those old programs cannot deal with all sorts of things liek changed driver APIs, UAC and other security stuff or even the changed default install folder locations...