[Rfdump] com port

[Denis *]

Hi all,

i want to use the live Image of RFdump from the RFdump page, hosted on a XP system. The virt. mach. is from the link on your site.
The config file for the guest system configures the com-port in this way: 

serial0.present = "TRUE"
serial0.fileName = "COM4"

And under windows the acg-reader is set to COM4 - so, it shut be works. But if i start the live image, it comes the error: "reset resulted in nothing followed" by the Messagebox: "Could not reset the RFID reader". I can remember, when i started the system the first time - everything was ok and the program was working very well. But i havenŽt changed everything and now it isnŽt working. 
With the original software for the reader, the reader works and if i first open the com-port with the original software (and donŽt close it) and try to start then the vm - it comes the error: 

"serial0: Unable to open the "COM4" serial port: Zugriff verweigert. Virtual device serial0 will start disconnected".

I hope you can help me whit my problem.
Thanks for your help in advance

Denis
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