downloaded this program, selected to use it just as a shell, and now i cant open anything even when i right click.
someone help

Restore the old windows configuration, and try again.

I'll be back when i found out exactly which file and line to replace.

I thought that it was system.ini, and then look 4 shell. but could be wrong, I'll be back

it depends on the OS. in 2k/xp the shell-setting is in the registry

http://lsdocs.shellfront.org/install.php