to make use of the System Restore feature ASSUMING your Operating System is Microsoft's Windows.

At the top of the window you used to create your post was this note:

Create a new discussion:
Note: If you're asking for technical
help, please be sure to include all your system info, including
operating system, model number, and any other specifics related to the
problem. Also please exercise your best judgment when posting in the
forums -- revealing personal information such as your e-mail address,
telephone number, and address is not recommended.

That information is necessary in order for us to offer valid suggestions.

Other information you should have told us about was whether or not you had found, been alerted to, or removed any malware of any type as well as ANYTHING you have done to solve the problem.