Okay, so I have found the registry entry that opens it but what should I do? Is kernel32.dll important? This is the entry that opens the system32 folder but I don't know if I should edit the entry or delete it.
I recently downloaded the zlob trojan disguised as a WMP codec (stupid, I know) and when I open IE (to compare HTML code to firefox) it comes up with sysnetsecurity.com even when I have the homepage as blank. How do I remove this?
edit: many claim to have used Sysinternals Autoruns program to remove this, but I want to know what I would do without the program. The people who have used the program say that <registry entry> pops up on some screen and there is a checkbox next to it - they uncheck it and it is fixed. I will use the Autoruns tool now, and thanks for all of your help.