In a case like this, I would use System Restore to roll back. If you do not remember the location System Restore at the Start Menu, borrow a computer....or find by trial and error. There also should be an 'undo' at System Mechanic....
Good Luck. You will need it.
I have just run Norton AV (no virus found) and used System Mechanic to clean files and registry. After restarting the computer, all the menus, dialog boxes appear in a different language (possibly Chinese). All programs appear to work, but I am unable to use anything as I cannot read the dialog box instructions.
The computer is Compac Evo and uses Windows XP pro as the operating system. Thanks for any help.