Script error on ASP.NET 1.1 pages

I got an error message on my aspx web page after one of the latest Windows updates:

Unable to find script library '/aspnet_client/system_web/1_1_4322/WebUIValidation.js'. Try placing this file manually, or reinstall by running 'aspnet_regiis -c'.

After trying to reinstall the script library, and reinstalling aspnet on my web application, I found a solution by simply adding the following code to my aspx file:


<script language="javascript" type="text/javascript" src="/aspnet_client/system_web/1_1_4322/WebUIValidation.js"></script>

Update:
After I put in the script-tag above in my "master page", I got an other error on pages not having any validation controls, so I had to put in a hidden dummy validator.