Hi Uvah, I noticed other oddities, the gradient is missing in the URLbar & Searchbar (You can see in my screenshots there's a gradient). It's not big deal but suggests some conflict in your system.
About the quick launch button, that's part of the Windows theme, I would try to change it (but it looks like you're using the default Win7), maybe it's the cursor?.
Try disabling all add-ons if the problem seems to be related to Firefox (then enable one by one to see which one creates problems). I suggest also to install Firefox Beta, a clean install may fix some issues (you could create a new profile for it. Anyway FF4Beta is very cool!
Anyway, I can fix the AVG toolbar if you'll email me, I'll write some code that you could test..
Sargan, it's easy to install through Stylish, if you're using Firefox 3, you'll find it in the Add-ons panel, or right-click the Stylish icon in the status-bar / manage styles.
Sorry to hear you like to uninstall, there's a totally redesigned version coming up, I'll upload it now and attach some screenshots, maybe you'll like to try before you ununstall...