Check in Control Panel > Add/Remove Programs... there you'll see which Java versions are installed. Remove whatever's there before installing the latest version.
If you're still stuck, remove whatever Java you have via Add/Remove Programs & then run the MS cleanup utility & ccleaner which are mentioned in this post:
http://www.gnutellaforums.com/333278-post2.html
After that, try installing Java again.
Which version of Pro are you trying to install?