New Microsoft Server Update Services Problem

I installed the new services yesterday and everything seemed to work fine.
But today I can't access the admin web page. When I try I get the following
message:

Server Application Unavailable
The web application you are attempting to access on this web server is
currently unavailable. Please hit the "Refresh" button in your web browser
to retry your request.

Administrator Note: An error message detailing the cause of this specific
request failure can be found in the application event log of the web server.
Please review this log entry to discover what caused this error to occur.

=============================================

Below is error message that appears repeatedly in the application event log.
I checked the Microsoft knowledge base for event 1084, and it says the
problem is Application Center cluster and the solution is removing .Net from
a member server. Well we don't have Application Center cluster or member
servers that I know about.

Thank you to anyone for any kind of feedback.
================================================

Event Type: Error
Event Source: ASP.NET 1.1.4322.0
Event Category: None
Event ID: 1084
Date: 6/23/2005
Time: 4:54:00 PM
User: N/A
Computer: AP_TH_02
Description:
aspnet_wp.exe could not be started. The error code for the failure is
80070545. This error can be caused when the worker process account has
insufficient rights to read the .NET Framework files. Please ensure that the
..NET Framework is correctly installed and that the ACLs on the installation
directory allow access to the configured account.