Vegas Pro 13 has suddenly started crashing during startup when it gets to "Initializing UI." As soon as it gets to that point, I get a "Vegas Pro has stopped working" message with the following error details:

Problem signature:
Problem Event Name: APPCRASH
Application Name: vegas130.exe
Application Version: 13.0.0.453
Application Timestamp: 55720ce9
Fault Module Name: clr.dll
Fault Module Version: 4.0.30319.296
Fault Module Timestamp: 50483916
Exception Code: c0000005
Exception Offset: 000000000001617d
OS Version: 6.1.7600.2.0.0.768.3
Locale ID: 1033
Additional Information 1: 4dc7
Additional Information 2: 4dc7ff7fc9717408d23896746cdae055
Additional Information 3: 67c1
Additional Information 4: 67c12ab590882f2e2f07ae947c62b997

Running on a Windows 7 PC, and I've never had this problem in years of working with the software. I've made no changes to this computer since the software was last working, so any help on fixing this problem would be appreciated.