I have Windows 7, I can't turn on my Windows' Security Center service, when I try to turn it on, it simply rejects it.

Hi, Please update the definition of your antivirus software and make sure the system is clean first. You can boot into Safe Mode and run a full system scan. Regards,Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.