Greg, I have seen av scanners do horrible things to the client. So if you have the option, get them to try downloading from citrix directly or else send them a cd. I had a few problems with the v11 client, any reason you aren't running 11.2? Berny On Jan 19, 2010 9:56 PM, "Greg Reese" <gareese@xxxxxxxxx> wrote: Anyone ever battled and error 1335 on Windows Vista when installing the Citrix Web Client? We have the 11.0 version on a website for our users. Some, but not all, Vista users run into this (maybe 3 out of 10). I don't have control over the affected computers, they are external to us. Google seems to think it is a corrupt cab file but if that were the case, I would expect to see it happen to everybody. Greg