Peter, I have been running DXbase2007 on Win7/64 since March 7th 2010. I'm using a Dell PC with Intel Core 2 CPU 6300 at 1.86 Ghz.- with 6 GB RAM, and no issues at all. If you got any USB -> RS-232 adapters in your system - get hold of the latest drivers...... ___________________ 73 de LA8AW - Odd-Egil _____________________