Hi all,

I'm trying to install SP1 on my exchange server, but I receive the following message:

"Setup has detected that the hotfix described in knowledge base article 831464 has not been installed. The hotfix is required for Outlook Web Access to function properly"

Well, then I try to download this hotfix and install it, but I keep getting a setup error - "the data is invalid"

Any suggestions

P.S
A few days ago I tried to install hotfixes for my Win2003 Server and the installation was failed

Installation Failure: Windows failed to install the following update
- Security Update for Windows Server 2003 (KB835732
- Security Update for Windows Server 2003 (KB828028)