If I see correctly, it's not relate to C::B, but to SDL on Vista/Win7.
Probably caused by a buggy graphics driver or a graphics-driver hacked to work on Vista/Win7, but broken by an update.
Whatsoever if it is not related to C::B (and it seems so), it's violating our forum rules.
This is neither a general programming forum, nor a forum dedicated to graphics programming or to find workarounds for buggy drivers and/or OSes.
This forum/website is dedicated to problems related to use C::B or to develop C::B !