Mhm, if you tried everything that way I don't know what else to say, I've 64 bit so maybe thats the thing, it's an early release, maybe with another Update or two it will work better, there is still plenty of stuff not able to use as far as I've seen, so patience.
Maybe try to download it again, delete the earlier version, it's worth a try, otherwise you should consider Upgrading but I don't know why it shouldn't work on WIndows 7 <-<