Starting with 6.2i, ISE uses a new version of WinDriver (version 6.03). This is not a regular version update for this driver, but includes a completely different .sys file (windrvr6.sys). If ISE 6.1i is uninstalled, the older version of WinDriver might be removed, which can result in the failure of various software tools that utilize this driver.
To work around this issue, follow these steps: 1. Reinstall the parallel port driver from the 6.1i install CD into the 6.2i install directory. 2. Remove the driver installation log notes from the fileset.txt file found in the ISE 6.2i installation directory.
If you do not remove these lines from the log file, a pop-up window will prompt you to update to ISE 6.2i each time Project Navigator is opened.