Hi 12eason, and welcome to Se7en Forums
Which version of SABnzbd
are you running? See SABnzbd.org : Home of SABnzbd+, the Full-Auto Newsreader » Blog Archive » SABnzbd 0.4.9 has been released
In addition, I don't see any specific mention of support for running this application on W7, so that could possibly be the reason, especially if it ran correctly on XP prior to you changing the OS. Another possibility is a driver conflict - to avoid these it is best to clean-install OSes.