Well. I am not sure if this will help your case. In my case of IDL5.5 HASP license, I failed to install on my winXP due to the old HASP driver. Following is the Tech Tip which I refered to. Good luck :-) ================================================= Article Title: Installing the latest HASP driver Article ID: 1706 Article Name: LICENSE25 Last Updated: 10/30/2003 10:05:00 AM Products: ENVI; IDL OS Platforms: WinNT 4.0; Win98; Win2000; Win XP Home; Win XP Pro Topic: An incorrectly installed HASP device driver can produce license error messages. The HASP device driver is a piece a software that communicates between IDL and the hardware key attached to the parellel port. If an IDL-based product prodices the error message "The license information you have entered is incorrect", the HASP driver may need to be re-installed. Discussion: Download the latest HASP driver from the Aladdin website. IMPORTANT NOTE: Windows NT/2000 users MUST be logged in with administrative privileges to complete the HASP device driver update procedure. Installing the HASP driver: Decompress the HASP Device Driver installer with WInZip or PKUnzip in a convenient location. Double-click the hdd32.exe icon. Select 'Next' Select 'Next' again Select 'Finish' Once the installer has exited, reboot your system. (The HASP driver installation process may appear to hang but it can take several minutes for the install to complete.) When the Windows restarts, enter the license information as directed in the Licensing and Installation Guide for your IDL-based product. If the application still indicates that the license information is incorrect, please contact Research Systems Technical Support at (303)413-3920, or by email at support@rsinc.com.