Well I don't know the solution to your problem, but I can help with your queries.
To enter safe mode, turn on the machine, (can't be accessed from restart), and press F8 repeatedly, throughout the POST (PowerOn Self Test - the white text on black background, that lists various processes before the Windows logo appears).
This will then load a menu, at the top of which is Safe mode, (with optional extras like network support).
To do a system restore, press F1 on the desktop for help, (or select from start menu if there), search for
Run System Restore
and the option to run the wizard is available for you.
MartyMcFly
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