Hi EvilEivind,
To expand on hodgey's response:
After capturing your video with
VirtualDub, you should edit your footage with a software called
AviSynth. AviSynth is a powerful video editing software that can be used for editing and restoring analog video. However, it has somewhat of a steep learning curve due to the fact that the program runs lines of code. Code for AviSynth is written in a simple text editor, such as NotePad. After you have installed AviSynth, you can save the code you have written as a ".avs" file type. ".avs" files can be opened using
VirtualDub.
VirtualDub has built in deinterlacing filters, but because your source is a cartoon, you would be better served to use an inverse tele-cine (IVTC) script. This requires that you download a Plugin for AviSynth such as
TIVTC and that you write a .avs script that tells AviSynth to use the IVTC on your source .avi footage.