If you run filemon you may discover that it's looking for missing files in c:\windows\installer and yes, why not go with R03? On Wed, Dec 31, 2008 at 4:39 AM, Berny Stapleton <berny@xxxxxxxxxxxxxxxxx>wrote: > > http://consumerdocs.installshield.com/selfservice/viewContent.do?externalId=Q111019&sliceId=1 > > > > 2008/12/30 Jez <jezosaurus@xxxxxxxxx> > > 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 >> > >