I can almost guarantee you that this isn't malware. . . based on your description it sounds to me like severe performance problems.
I have been running msse and norton 360 together since msse came out
I'd start here. Get rid of either MSE or Norton. I'd recommend losing Norton, but it's up to you.
I do not recommend that you have more
than one antivirus product installed and running on your computer at a time. The reason for this is that if both products have their automatic (Real-Time) protection switched on, then those products which do not encrypt the virus strings within them can cause other anti virus products to cause "false positives
". It can also lead to a clash as both products fight for access to files which are opened again this is the resident/automatic protection. In general terms, the two programs may conflict and cause:
1) False Positives
: When the anti virus software tells you that your PC has a virus when it actually doesn't.
2) System Performance Problems
: Your system may lock up due to both products attempting to access the same file at the same time.
See if your issue gets better after uninstalling one of the AVs.