
Microsoft charges hardware manufacturers for "WHQL" certification for their drivers to prove Windows compatibility. Some manufacturers choose not to pay Microsoft and therefore their drivers are not certified. RadarSync only delivers drivers from reputable hardware manufacturers and we therefore recommend download and installation of both WHQL and non-WHQL drivers. In addition, Microsoft no longer accepts certification submissions for the Microsoft® Windows® Millennium Edition operating system and Windows® 98. As a result, drivers updated since that time for the Windows Millennium/98 Edition operating systems are non certified WHQL.