Are any crash dumps created matching the times of the crashes? If so, please zip them (only the ones you know are due to this) and email them to leo@gpsoft.com.au
It may also be worth a try to set another browser as the default web browser, to see if the problem still happens or is specific to a certain browser. (It's also possible that restoring the original browser then makes it work, if the issue was something weird in the registry which was repaired by re-assigning the defaults.)