Ricta, if Studio 8's default capturing programme worked, why do you say you are now going to start using a different programme to capture, and then edit with studio 8? You seem to have solved the problem capturing with studio 8.
Studio 8 captures as an avi file, unless you ask for MPEG or preview quality, and edits anything it's captured. If you have plenty of disc space, stick with avi. Studio 8 can't edit wmv files. Also if you capture in MPEG, Studio has to convert while it's capturing, which is time consuming.
Once edited you can 'make movie' in several formats, none of which is Quicktime, but you can make avi/back to tape, MPEG for VCD, S VCD or DVD, Real time in various qualities and WMV files in 3 qualities. Avi, MPEG and wmv will play in Windows Media PLayer. Real and wmv are intended for the web.
What do you want to do with your movie once you've editied it?
Win XP, Athlon 1.8, G force 3 T, 1 60gig drive + 1 250 gig, Pinnacle Studio 9 plus mostly, Premiere 6, and Vegas 5 sometimes, Soundforge, Cool Edit.