Speedfried, I guess you haven't seen the INPA & EDIABAS FAQ DOC.
Here is a link....
http://files.ka81.com/docs/INPA_FAQ.pdf. How to set FIFO buffers is explained .
Here it is ...Choose the
following path in the regedit: HKEY_LOCAL_MACHINE System
CurrentControlSet click on Services. On the right side of the window You can
click on the name of the DWORd value which is defective (here RxFIFO & TxFIFO). Enter the value 8 with the base hexadecimal. Click Ok an close the regedit. Now You
can start the Tool Set or INPA without an error.