Damn that sucks tubebuoy.
Browser Helper Objects (BHOs)
A lot of spyware and BHO's are written quickly and poorly. This can cause anything from incompatibility issues to corrupting important system functions making them not only a threat to your security but to your systems stability. The programmers of spyware applications obviously do not care about you or your system other than as a source of marketing information so they do not error check most of their products.
Some companies go out of their way to hide the presence of the spyware BHOs that they install. They go so far as to find ways around the most popular detection tools by changing their product regularly just enough to avoid detection until the next version of the detection software comes out.
To see what BHOs you have installed on your machine right now, You can install BHODemon from Definitive Solutions. BHODemon will tell you about any BHO installed and allows you to disable it and re-enable it if you wish.
http://www.spywareinfo.com/articles/bho/