Use System Restore to Undo Malware
Have you ever had your computer infected by malware? In the best of cases its a pain in the ass. In some cases the malware can be quite tenacious and virtually impossible to extricate from the system.
What would be cool is if, instead of scanning and identifying and removing the threat the hard way, you could just go back in time to a point before the computer was compromised and either implement some form of protection against the threat or avoid the site or application that infected the computer. That would be awesome!
Good news! You have such a time machine. It is called System Restore. Windows saves restore points prior to events that could have an adverse affect on the system, like installing new applications. It also save restore points periodically- just.in.case.
Check out Undo Malware With System Restore for more details. Next time your system starts acting wonky- try going back in time before you spend hours banging your head against the wall doing things the hard way.