If this problem has not existed for very long try doing a System Restore to a time prior to it starting.

Do you have more than one user profile on your system, if so, have you tried logging in with a different profile to see if the problem exists globaly or just in your normal profile? If the problem is with your profile only then this would suggest that the profile is corrupt and you should create a new profile if you don't have another already.

Another option is to run the System File Checker utility to determine if you have any corrupted or missing critical Windows files.

Lastly try temporarily disabling your AntiVirus and Firewall software then try to access the Event Viewer management console - it is probably best to have your computer disconnected from any internet access when doing this. If this succeeds then check for any events related to the error in opening the Event Viewer - you may find it easier to clear all the current events first then recreate the error and look at the logs again to identify the most current and relevant entries.