pull-down menu

Microsoft Windows 98

i downloaded from the net trial games.
somehow this has upset some of my programs.
for instance, the pull-down menu in explorer does not stay
open long enough to choose anything.
on the desktop now, when i right-click my mouse which
would normally give me opportunity to view commands
available, nothing occurs.
If this is recently restore a good registry.

at a DOS prompt execute

scanreg / restore and select a registry backup date just prior to your
failed or bad installation.

follow the instructions.