Multiple Windows Opening Up / Virus?

A couple of times I have had numerous windows opening up simultaneously. The only way to stop them was to shut down the computer. I went to the Windows 7 Forum and it was suggested that I download several Malware Products such as:

 

Malware Bytes

Superanitispamware

Microsoft Security Scanner

 

Some of the comments in the forum seem to indicate that it is a Virus not picked up by the antivirus software. Before I do that I would like your opinion since Norton is running scans and have not detected any problem. I did get a couple of times messages from Norton showing Error 3048,3. I have no idea if these two issues are related. Both issues (multiple windows and the error) have occurred twice in the last couple of weeks.

 

Thank you, AG