Have a look at this web site;
http://www.sophos.com/security/analyses/trojlmirex.html - under the Advanced tab for details.
Anti-virus programs may not be sufficient to remove trojans and you really need an anti-spyware program, but I think at this stage you now need personal help with this. I would recommend running HiJackThis and posting your HJT log at one of the specialised HJT log analyst forums to step you through recovery.
The guidance in this post will help you;
I have this error on my computer C:\windows\system32\rundll32.exe
I was advised to download a new rundll32 to repair mine but I can't find any where on Microsoft web site.
I have or had a virus. I was running F secure online scan when these problems all started. I have an error KB8964225.log on my screen every time I restart.
I cannot access many programs obviously as the rundll is the base for a lot of things. I cannot get into system restore etc
Your expertise would be appreciated.