I recently purchased a Netgear WPN511 PCMCIA card for my laptop but found that it randomly crashed with the Blue Screen of Death - BSoD. The offending driver was WPN511.sys.
I made sure that I installed the latest Netgear version 1.3 device driver (Jan 2006) which still resulted in random crashes (Blue Screen of Death - BSoD) under Windows XP. This was driving me mad, the crashes would happen randonly after minutes, hours or perhaps if you were extremely lucky 1-2 days. A quick examination of the device driver shows that it has been developed primarily for Windows 2000, the driver is not stable under Windows XP.
The solution is simple, un-install the Negear driver, then download the latest Atheros generic device driver (WPN511 uses the Atheros chipset). I used Atheros version 22.214.171.124 (July 2006)and the BSoD issue has disappeared. This driver supports Windows 2000, Server 2003 and Windows XP. This driver supports Super G (108Mbps). Below is the link to this driver.
By the way, I raised a support call with Netgear on this issue, what a waste of time!!! Extremely poor support. Got the issue raised to their L2 support guys but they didn't have a clue. I informed them of the issue and the fix but the L2 person didn't know what to do next, seems driver releases are done by another group and she didn't know how to proceed to get a new driver issued. What a joke!!!