HI
Videopad has Deshaker already installed and does not require the Virtualdub plugin.
If you right click the clip entry in the media list you will see the option to "Stabilize Video"
Clicking this will allow you to set the quality and the folder in which the stabilized clip will be placed. (This folder can be preset under the VP "Options" tab.)
You can also configure deshaker or reset the values. You will find that the default values generally work OK but I have posted (big post) the technical explanation for all the settings.....and I don't pretend to understand them all!)
http://nch.invisionzone.com/index.php?/topic/20929-questions-around-deshake/ (Post #2)
Once the two passes have be made of the clip, you will have the option to replace the existing clip with the stabilized one.
If you have actually added the Virtual dub deshaker plugin, the VP option will not work so you will need to go to the folder where you loaded it to and remove it and also reset the plugin pathway.
Nat