If it is still of use to you –
You can download virtualdub https://prdownloads.sourceforge.net/virtualdub/VirtualDub-1.6.14.zip?download
or virtualdubmod
https://prdownloads.sourceforge.net/virtualdubmod/VirtualDubMod_1_5_10_2_All_inclusive.zip?download
which is a variation and will serve you just as well which either come as an installer or as a standalone program in a zip file. Windows should unzip it, copy it to a folder and it should run. It is a free video editing prog and if you install huffyuv which is a codec and requires an external program to compress, it should allow you to export avis with compression. You can also set it up to a render queue if you have a lot of files to convert and then leave it. Email me if you have any problems