Vista - Halo 2 Crashes

This started today. I have been playing for months with no issues. No new apps have been installed on my pc or no modifications have been made.

I was playing the single player campaign for the past week with no problems and this started a few hrs ago this evening.

I load up select level and difficulty...the game seems to load and then this error.

Problem signature:
Problem Event Name: APPCRASH
Application Name: halo2.exe
Application Version: 1.0.0.11122
Application Timestamp: 46d3153c
Fault Module Name: halo2.exe
Fault Module Version: 1.0.0.11122
Fault Module Timestamp: 46d3153c
Exception Code: c0000005
Exception Offset: 0006f6c3
OS Version: 6.0.6002.2.2.0.256.1
Locale ID: 1033
Additional Information 1: 1acd
Additional Information 2: a9c80722b816b7308cbea4599bc30825
Additional Information 3: 1156
Additional Information 4: da7061a0b31b08df17e69f00e2067ba2

Thanks in advance for any assistance.

Hello Dick Steel,
Have you installed a Windows update ?.
Also you could try a system restore to a point before this started.