Try uninstall any other Citrix patches you have installed and then go to Add/Remove programs and run a repair on Citrix Presentation server. Then try R01 again. Chris ________________________________ From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Jez Sent: December 30, 2008 11:28 AM To: thin@xxxxxxxxxxxxx Subject: [THIN] Hotfix Rollup Pack PSE450W2K3R01 - Won't install Hi, I have a site where they are unable to install PSE450W2K3R01. Product: Citrix Presentation Server for Windows - Update 'PSE450W2K3R01' could not be installed. Error code 1603 We have patched VC++ and are running License Servre 11.5 => prerequisites are fulfilled. MSI Log stated that the patch could not be installed and failed with error code 1603 Any suggestions as to what to look for, or any recommendations for more recent patches? TIA, Jez ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________