GUI of 'pci express high performance reference design'

I did not try it fully, since, I found it to be a bit complicated.

But, I found that this error in my case was due to trying to run the ref design under Win 7.

I believe it is possible to try it only under Win Xp 32 bit.

Give that a try maybe using VMWare.

I have moved on to another ref design which is much simpler, form Xillybus.

Try to google Xillybus and you should be there.

It gives a basic fee of the PCIe communications.

Stream read/ write. Writing/ reading to/from FPGA SDRAM etc.