Did you read the documentation?
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Prior to the release of Reader XI, Reader could not use the spawn method.with Reader unless special Reader Extended Rights were applied to the PDF by Acrobat or a LiveCycle Server. The "F" in the fourth column (Availability), of the Quick Bar provides the documentation about this restriction and other information for version or depreciation, save and preferences, and security.
Reader XI no longer is subject to this restriction.
Thanks for helpfull information and fast reply!
How to add special Reader Extended Rights to the PDF by Acrobat? (I have Acrobat 9 Standart)
You version is not capable of doing it.
You need Professional if you expect to receive back less than 500 forms, after that you should purchase a LiveCycle Server product.
Another approach is to ecourage users to upgrade to Reader XI.