Even though our installer is 32bit, it is designed to work on 64bit PCs. We don't have a separate installer for 64bit PCs.
That being said, does your RealPlayer run slow all the time or only when you do something specific?
Please follow the instructions from the below link (even though you reinstalled RealPlayer previously. These are slightly more advanced steps.)
Please note: If you have any playlists created, you will have to recreate them.