Hit ctrl+alt+delete and go to applications. Highlight 'Go Back' and hit 'End Task' wait for it to shut down. If you get a message like 'this program is not responding', hit 'End task' again. This will stop it interfering, but will not stop it for good.
I have never heard of the 'Go Back' program, but you may want to disable this altogether. Follow this:
Go to start>programs>startup and see if there is any reference to 'Go Back' in there. If there is, delete it. If there isn't, copy msconfig from a Windows XP machine onto your machine, otherwise search for msconfig on the net, and copy it to your machine. Msconfig belongs in the directory:
C:\WINDOWS\PCHEALTH\HELPCTR\Binaries
Go to start>run and type: msconfig
Then go to the startup tab and look for any reference to the 'Go Back' program, and uncheck it. This should solve the problem.