You have to use a product key generator to decrypt the serial number. Option 3: Ask your Adobe Acrobat provider for the serial number You can ask the provider from whom you got or bought Adobe Acrobat for the serial number. #Adobe acrobat 9 standard serial number generator pdf.#Adobe acrobat 9 standard serial number generator serial key.#Adobe acrobat 9 standard serial number generator serial numbers.This problem is clearly one which is caused by system file changes and I need to get Acrobat operational soon. It may be relevant that this system also has CS5 on it. It was only when I ran an sfc scan to resolve some other issues that this problem started. After the Vista to 7 upgrade, Acrobat ran perfectly with no problems. It is the exVista system that is causing the problem. I note that for whatever reason this system does not have FlexNet on it at all. It functions properly without any need to eneter a serial number. I have encountered no problems with the system that was upgraded from XP. Both have recently been upgraded one from XP and one from Vista both to Windows 7. If I choose to re-enter the full 24 digit serial number, I get a green tick telling me that this is a valid number but when activation starts I am again told that the 20 digit number is incorrect.

It shows only a 20 digit number as being incorrect. As soon as I opened Acrobat, a message pops up telling me that the serial number is incorrect.

I entered the serial number during installation which was accepted. I Uninstalled the software, did the clean up and reinstalled Acrobat 9. My solution of removinng the file in FlexNet only worked for one day and when the computer was resarted the following day, the same problem occured.

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