New / Unknown Virus

I have a virus on my PC that is not being picked up by my Norton IS2012. The main problem is a number of cookies that are not being deleted, even though they are being picked up by virus scans. I already tried Norton's Power Erasure, that didn't help.    The ''free'' version of AVG found an unidentified rootkit that it could not delete.

 

1) How do I get rid of this (new?) virus?

 

2) How do I inform Norton that I have a virus not being detected by scans?

 

Attached is a screen shot of the cookies Norton says are there but ''not detected?''   (There are actually *9* , even though the scan only shows 5.)

 

nondeletedcookies.JPG