Please can you provide the following info?
Antivirus Product - What Antivirus Product is installed on your system
Product Version - What Version of the product is installed
DAT/Signature Version - What version of the DAT or Signature files are installed
Enginer Version - What version of the antivirus engine is installed
Some things to try if you've not already done so:
1) Run a full scan of your machine - is anything detected?
2) Run a scan with Stinger and Artemis enabled on very high (details here: http://vil.nai.com/vil/stinger/)
Please report back once you've tried the above.