I have spent the last week trying to get a purchased application's upgrade installed on several workstations. I think only one of the installs went smoothly. By week's end I was totally frustrated with the installation of this product upgrade. Most of the workstation errors could be corrected by un-installing / re-installing the product. It seemed that most of the issues were related to an incomplete uninstall. However, on Friday I received the same error on a workstation that did not have a prior version of the product installed.
Error 1327 Invalid Drive U:\
There most odd thing about this error showing on the second workstation, was both workstations had Drive U in the error message and neither workstation had drive U; mapped for any profile. Thankfully I received the error on a workstation that did not have the prior version of the product installed or I would have continued to blame the product. Turns out it is an Install Shield error - a known Install Shield error since Dec 2003. Here's a link to information on the error at Install Shield Consumer Central. After reading through this information I decided to scan the registry for U:. On both workstations I found a drive mapping of Personal to letter U: - buried deep in some key I would have never found logically. Deleting this one key cleared the problem. BTW... the Title Bar on the modal error message window I received was the name of the product I was installing - nothing indicated to me it was an Install Shield error.