|Open regedit and search for runonce.|
When found, at the left side, you will see Run directly above the Runonce.
Click on it.
Here you'll find the things that will be started automatically during startup windows.
Look for an entry which uses rundll and delete it.
Then press the F3 key to search further more.
And again, left side, click on Run and search the right side for rundll.
Do this until you get the message, that there is nothing more found.
Please send a reply, if you solved the problem !!!