Vista - World of warcraft crashes, how to read error message?

Hello im wondering how i decide the reasonfor a gamecrash? i get an error
message and im wondering if it is a game issue or windows or even hardware? i
have used a fully registrated windows vista premium 64 bit version almost one
year with no real problem and now this happens all of a sudden when i play wow

Im trying to post two pics of what the message saying below:

http://farm3.static.flickr.com/2359/...1e10c439_o.jpg

and

http://farm3.static.flickr.com/2259/...e1e2f8b2_o.jpg

Any help on how to solve this i much appriciated, and not having to
reinstall either windows nor wow would be nice!

/Peter