I installed the free trial version of Mathematica 3.0 on my system
which alread had version 2.2 on it. When the trial period expired,
the program gave me the warning that it was over so I uninstalled it.
Now, when I try and run my registered version of 2.2, I still get the
screen informing me that the trial is over and I am unable to use my
2.2 at all.