Adobe Acrobat Pro XI activation

I am having issues with regestering my Pro XI.  Don't seem to get any help from tech support.  I was told to uninstall and reinstall, well I can not uninstall or modify.  I have been trying to PDF a document, and it keeps throwing me out.  I bought this through work, which was a bulk purchase, because we needed it for work and since most of us, worked from home, we were allowed to buy one for home.  I have the CD, key code and still having issues.  Any ideas