Effectively, I'm getting an IRQL_NOT_LESS_OR_EQUAL bluescreen quite frequently on two computers I've installed Windows 7 on. Both are hp pavilion models, one a tx2617ca, one a dv9231ca. The tx2617ca is brand new, less than a week since arrival. Both machines are dual booting vista and win7 and have absolutely no bluescreen problems on vista. It seems to occur most frequently when watching video files, though that isn't always the case. What can I do to try to find the cause of these bluescreens and correct it? Considering that one of the computers is a tablet pc, which is so much easier to use under windows 7, it's imperative that this problem is fixed.