Lost access to files,browser email after installing internet security 2011

Hi,

 

I installed internet security on my desktop, and after a restart my firefox browser and thunderbird email are gone.  I have the basic internet explorer on the screen...all my shortcuts are gone as well as access to my files, pictures, etc.

 

I feel I have been sabotaged by Norton....  I even tried system restore to no avail... I have windows XP

 

Can anyone out there help?