I wish people would update there virus scanners and not open attachments sent via email. Put the files up on the web and send a link, or something, anything! As I check my logs, my virus scanner has stopped 306 viruses from entering my inbox, most of which are Gibe.F
So beg your ISP to install server side virus scanning, and install a client side scanner! And more importantly set your client side scanner to update its definitions every day!