System Restore question

I've had bugs in one of my computers which system restore took care of.

The question is whether the virus may still exist (and being masked) even when the computer is brought back to a restore point? Also how many restore points do you use and how many are recommended?
 
Yes, its more than 75 percent probable that your system still has remnants of infections as malware will hide in system restore points. Even though you may not have symptoms of anything being wrong after the restore, you should asure yourself that you are clean by scanning your system with Malwarebytes and whatever virus program you use. System restore is usually the last choice to clear yourself after being infected. If you keep yourself clean there is no need to keep restore points for more than a week at a time.
 
What wonderboy said + a little more info.

If a full system scan picks up an infection in the "shadow volume copy" or an odd location that you can't see in the system root then it has probably infected the system restore point. AV software can rarely clean the restore so in this case you should purge it by disabling the feature and rebooting.
 
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