Hi hilton
The problem not from window vista its from serial to usb converter so if u need to use the window vista for Ericsson OMT RBS 2206 or 2216 or any kind of Ericsson RBS u need a special converter. Only the USB 2.0 to RS232 convertor can work with window vista and you can enter the omt for RBS Ericson with out having any problem .
Regard
Jamil