need help with rundll32.exe

I cannot go into several places I need to go. Was getting message that rundll32.exe could not be found. now just get blank screen. Cannot read mail,get on yahoo messenger can't even go to internet explorer properties or add or remove programs.

Follow the instructions in this post:

http://www.techhelpforum.com/showthread.php?t=3702

Then start a new thread in that (HijackThis) section.