Can't get into admin to update store

[ImagineThat]

Both last night and this morning when I attempt to sign in to the admin part of my store to make changes, I get the following error page:

 

"Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

 

Please contact the server administrator, [email protected] and inform them of the time the error occurred, and anything you might have done that may have caused the error.

 

More information about this error may be available in the server error log.

 

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

 

 

Apache/2.2.8 (Unix) mod_ssl/2.2.8 OpenSSL/0.9.7a mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 Server at www.itscrapbooking.com Port 80"

 

I am sure that I am using the correct sign in name and password - any ideas what's going on??