I'd say a real virus is somehwow masquerading under Zoombrowser alias, or AVG is somehow detecting bogus virus.
I have used Zoombrowser on my PC's (desktop and laptops since 2002, under WinXP and under Win7, with Malwarebytes and Spybots Search and Destroy as spot checks, and with Norton Internet Security and later Microsoft Security Essentials as scheduled full scans, and never have any of the four programs found any issues with Zoombrowser.
I still like using Zoombrowser for my wife to review photos I have taken after social gatherings, etc. and even for the very occasional use of my desktop printer to make a quick print of a photo (I prefer sending most prints out to Costco, rather than printing inkjet at home)