I installed SQL Express on my workstation some time ago and don't remember what password I assigned to sa.
I can login using Windows authentication, but it doesn't allow me to do any operations, such as add a database. Is there a way to reset the password, or do I have to remove and reinstall SQL in order to proceed.?
Unfortunately the answer to this is no. You will have to un-install and reinstall. If you make a backup copy of any user database files you have, you can use sp_attach_db to reattach them to the new installation.
Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.
This very simple solution applies to a narrow cross-section of the "needs to close" variety.
In this case, the full message in Event Viewer was in applog, Event ID 1000:
Faulting application iexplore.exe, version 8.0.6001.18702, faulting module …