If it happens again, write down the error message itself (the all caps line near the top), the file it occured in (if given), and the address information:

The 'If this is the first time you've seen this...' bit is just explanatory text and has no bearing on the actual issue involved--the marked parts are what's important. This is just a sample BSOD so the actual one you get will vary, but the general format will be the same.