You can install f-prot antivirus and use it to scan windows partitions, this is how I've done it recently:

1. Start by opening a root shell (K-->Knoppix-->Root Shell)and typing : passwd, to set a root password.

2. In Konqueror, navigate to this site
http://www.f-prot.com/download/trial...ux-ws-deb.html and click on the "Download F-PROT Antivirus (GNU/Linux, Workstation, deb)" link, and choose "open with Kpackage" when prompted. When it finishes downloading click on the Install tab at the bottom of the Kpackage window. Use the password that you created in Step 1.

3. Mount the drive you want to scan by right clicking on it's icon on the desktop and choosing mount.

4. In your root shell , type man f-prot to read the fine manual .

5. For example to scan drive hdb1, type: f-prot /mnt/hdb1

HTH