Downloaded the latest update for Blackberry Link yesterday for Windows XP 64bit. Now it won't load. Services won't start. What to do? How do I go back last version i was running? I have gone back to Version 1.1.1.32

Re-download or try the 32 bit version. Some software will work on 64bit PC's some wont.

Sounds like the download was corrupted. I would try a new download first but make sure you fully delete the old version with the exception of any backups.

This is the message Im getting:

Error 1920, Service Blackberry Link Communication Manager (RIM Tunnel Service) failed to start. Verify that you have sufficient privileges to start system services

That's a PC error indicating the PC OS or virus software is blocking the application from running. You might check the permission levels or restrictions the AV software or other firewall my be placing on the PC. You have some type of control issues