You could do what i've done here, using linux and tvtime to de-interlace the signal from the amiga in sw, i havent tested on windows as i dont have windows, its a hercules card. But any will do. Im not 100% happy about the picture quality tho, so i've already placed an order for one of those rgb > svideo things, that _should_ improve things, i hope. Im not entirly sure i get to keep my screenmode and overscan tho(?)
http://i26.tinypic.com/33dwcgg.jpgTaking it one step further, you could output the picture via your tvout on your puters gfx card to your tv/projector/whatever ^^