DLink DWL 650+ Problems

Trying to install a DWL 650+ card onto Inspiron 7000. Get system conflict stating "The NDIS.VXD, NTKERN.VXD device loaders for this device could not load the device driver (code 2). Tried reinstallling several times. DLink site implies BIOS may need updating. Tried this but get message "Cannot flash when memory managers (eg EMM386) are present"

Is it the BIOS? Or something else? How do I update BIOS which is A02?

Need to get this wireless card working asap.  Can anyone advise?

Thanks