Hi,
It sounds like your PC is not seeing your hardware key.
You can probably ignore the "checkplusid" utility. Older versions of PADS had the ability to use a "CPLUS_ID" hardware key - and it sounds like that utility is related to that dongle rather than the FLEXID=9-........ dongle you mention.
You will need the hardware key drivers for that version of PADS. My software archive starts with the 2007.2 release and this gives you options to install hardware key drivers at the time of installation. If you re-install and look out for hardware key / dongle drivers / an option to install licensing, then you should be able to locate them. If you install licensing, and locate the "lmtools" utility, you should see the hardware key listed in the "System Settings" tab.
Another utility installed with licensing is "pcls_ok". You can use that to test if the "pwrshell" license is available. The "Details>" box should give more clues if the license fails to check out.
It is also worth checking that your license has not expired if you have not used PADS for a long time.
Finally, you mention re-setting the date on your PC. If you get a message about "System date set back", please let me know by replying to this message.
Regards,
David