Follow steps 1 through 3 to browse [Add/Remove Programs] in [Control Panel] and remove all existing SmartRF Studio installations. Search + remove all files from the Windows folder. Search + remove all files from the Windows folder. Search + remove all <*.*nf> files related to cc2400. Search + remove all <*.*nf> files related to srf04. Follow steps 1 through 5 to browse [Add/Remove Hardware] in [Control panel] and remove all USB installations related to CC2400EB and SRF04EB.