DV QT files captured on a Mac should work fine on a PC. Any NLE will accept them without having to convert. If you are really worried, you can just recapture the footage.
Yes, I meant DVX - I thought that windows would play the Quicktime files fine as well but they show up as read only files. I can convert them into MPEG, AVI, WMP etc with a converter but the playback freezes up. Any solutions?
What are you going to do with these files? Edit them? They should import into any NLE without a problem. From there you can export out to native DV-AVI files. It sounds like whatever conversion program you are using isn't that great.