Any experience of RETAIL MAN

Does anyone use Retail Man POS software?.  My clients have started using and have just given me the data file for their March 2012 year end.  I have downloaded a trial copy from Retail Man website and imported the data into it but it won't let me run any reports.

I keep getting warning message ' Warning This network station was taken over by VICTORIA-PC'      NB this would be the main PC that the software is run from.

I have gone back to the client to see if they know how to work round it. 

Client hasn't yet worked out the import/export facility hence giving me the data in this form.

Any ideas?