Thanks so much mate! You rock

thanks I hope it works instead of Bitdefender firewall it was avast firewall keeping fingers crossed!!

I had a very similar problem on an Acer Ferrari One 200 running Windows 7.

When the bundled subscription to McAfee AV/security ran out, I uninstalled it through Control Panel - Programs - Uninstall a program. Restarting Windows led to a BSOD including -

DRIVER_IRQL_NOT_LESS_OR_EQUAL
……
ndis.sys

From Safe Mode, I did a System Restore to the settings of the previous day. I then tried the uninstall again but with exactly the same result.

Checking in Computer - System Properties - Device Manager, I noted that there were two WiFi devices ‘Atheros AR5B93……’ and ‘Microsoft Virtual WiFi Miniport Adapter’. I disabled the latter.

I then did a System Restore as above, and found that WiFi worked fine with the Microsoft device disabled.

Finally I carried out the uninstallation of McAfee but did NOT restart. I installed Microsoft Security Essentials and then restarted.

No BSOD!

I don’t know which step (disabling the device or not restarting after uninstallation) solved the problem but everything works fine.

Disabling the adapter did the job. Re-installation of the device driver will get it fixed too.

Thanks for sharing.

I have the same problem as Tim also, but what if I’m in safe mode on my Windows 7 and I can’t use the internet also. My network adapters are Microsoft 6to4 Adapter and Microsoft ISATAP Adapter. Is one of them the problem of my ndis.sys problem?

By the way, if I installed my AntiVirus software, Titanium AntiVirus +, will it be fixed?

Speaking of which, I even have Broadcom Netlink (TM) Gigabit Ethernet and DW1525 (802.11n) WLAN PCIe Card. Are those the problems? I think the 2 I said on the last comment aren’t the problems. I think one of these are.