Hi,
I had the same problem today. AE crashed with always different error-messages. Finally I could fix it by re-creating a new preferences file.
To re-create the After Effects preferences file:
1. Quit After Effects.
2. Rename the Adobe After Effects 8.0 Prefs.txt file (for example, toAdobe After Effects 8.0 Prefs.old) in the C:\Documents and Settings\\Application Data\Adobe\After Effects\8.0 folder.
3. Start After Effects. After Effects creates a new preferences file.
If the problem continues, the preferences file isn’t the cause. To restore custom settings, delete the new preferences file and restore the original name of the previous preferences file.
Hope it help you as well
Giorgio