Recently upgraded to Windows 8.1, also decided to upgrade from my wireless netgear USB card to using a Rosewill Wireless Dual Band PCIE card. Every time I physically install the Rosewill card I get blue screen upon boot "IRQL_NOT_LESS_OR_EQUAL". Attempted installing drivers prior to installing card since it appeared to be a driver issue. Still get blue screen. . . Thinking this may be caused by the netgear drivers still hanging around, or due to the internal NIC that is a part of the mobo. Any thoughts on this? Was wishing to get 300MB/sec with the new NIC, it says it is windows 8 compatible. . . should I hop in device manager & disable the 2 NICs in there prior to shut down/install?