I wanted to advise I am also having the same problem.

My OS is: Microsoft Windows VistaT Home Premium - Win 32_ Operating System, Win 32_Computer System, CSDVersion Service Pack 1

The problem event name reported as:

Problem Event Name: APPCRASH
Application Name: SketchUp.exe
Application Version: 7.0.10247.0
Application Timestamp: 499de0d8
Fault Module Name: Secur32.dll
Fault Module Version: 6.0.6001.18215
Fault Module Timestamp: 499533b0
Exception Code: c0000005
Exception Offset: 000021b3
OS Version: 6.0.6001.2.1.0.768.3
Locale ID: 1033
Additional Information 1: cb1e
Additional Information 2: 79ac73f13bd1513b55fdc07e54106a3a
Additional Information 3: 5191
Additional Information 4: 291e1652affcc1b6558509d2dd528192

At first, I erroneously installed Sketchup Pro 7. I uninstalled it and then attempted to install Sketchup 7, the non-pro version. Could this be the issue? If so, we may need a resolution at the registry level to remove all evidence of Sketchup Pro 7.