Can't access my system restore

Hi there I think I got a virus not sure... Can some one help me on these issues i have been getting?
-Can't access my system restore and it appears deactivated.
-My anti-virus gets deactivated and when i re activated it re-deactivates in minutes
-My mouse freezes from time to time in lapses of 2 minutes or so
-My PC turns of unexpectedly.
Can someone advice?
In advanced thank you so much

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