I have gotten several of these with 0.5 qt client. I've been submitting them to MS, but I don't know if anyone checks on that. Here is the copy pasta from the error report. Thanks for all your previous and ongoing work.

Problem signature:
Problem Event Name: APPCRASH
Application Name: bitcoin-qt.exe
Application Version: 0.0.0.0
Application Timestamp: 4d44aa00
Fault Module Name: bitcoin-qt.exe
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 4d44aa00
Exception Code: 40000015
Exception Offset: 00c88098
OS Version: 6.1.7601.2.1.0.256.48
Locale ID: 1033
Additional Information 1: ab9a
Additional Information 2: ab9a49250287dc400f9fb01884665d59
Additional Information 3: 6186
Additional Information 4: 6186ebe04a8ada4fd32e023151385964