get message:no program is associated with this file to run this ac

Tech-Archive recommends: Fix windows errors by optimizing your registry

My computer is in a bad situation.
almost all icones on the desktop, all programs at the menu (start,
programs...) and all icones in the control panel do not function.
the message I get when I try to use them is (translated from French): "no
program is associated with this file to execute this action. create an
association using the application file option in the control panel"
I tried to do system restoration but it responses the same way.
I think that the problem started when spybot asked me if I authorize changes
in registery and I replied no.
since than I can't open any program or utility (luckily explorer stil works)
Does someone have an idea how can i make system resoration.
or should i try to repair windows with a windows cd.

thanks in advance for your help
Amir
.