dont know man, i did have this problem before and it was fixed by un-checking this options (first days using gsa), i dont think it can be a problem with windows install , try with gsa support , you have them here in forum.
Also how big is your list that you are trying to avoid some sites?
If you cant solve go uncheck engines about this sites and prevent gsa to post on them.
Or you may have Web 2.0 , videos and document sharing engines checked, these are bult-in builded??