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Windows 7: Cisco VPN issues on Windows 7 Beta

11 Jan 2009   #11


dblizz - have you checked which drivers you're using for your NIC? If you upgraded from the WDDM drivers to your OEM drivers, try reverting; if you *haven't* upgraded from WDDM drivers to OEM drivers, try doing that.

NDIS should be around for many NICs, but OEM drivers *may* not include them as it is considered (erroneously) as legacy....

My System SpecsSystem Spec
11 Jan 2009   #12

Windows 7 Beta 1

Have a Broadcom NetXtreme. Upgraded from HP a bit ago. Same thing. My wireless nic driver is dated 10/ I'm not worried about that one. Not sure what could be trying to use NDIS.sys.
My System SpecsSystem Spec
11 Jan 2009   #13


Yet, you should be - perhaps the included NDIS driver with that update is corrupted - try rolling back the drive to the W7 default driver and see if the VPN works (this is admittedly a long shot - but I am hoping that the that will replace your NDIS with a default copy as well. If not, I may just copy mine and send it over to ya....oh, wait, I have upgraded to my nVidia Ethernet drivers also, so that NDIS may not work for you....*if*, of course, they are not using standard generic NDIS drivers to begin with - which is what I suspect is happening here.)
My System SpecsSystem Spec

11 Jan 2009   #14

Windows 7 Beta 1

Got it working. Here's what I had to do. Rollback my wireless driver. put another random ndis.sys in place. install the VPN. Boot up. Update the wireless driver. reboot. Put the Windows 7 ndis.sys in place and it works. Pretty weird.

Not sure if I understand why though.

Thanks for all your help.

My System SpecsSystem Spec
11 Jan 2009   #15


as much as I figured - the driver was replacing the default NDIS driver which then caused your VPN to go stupid....
My System SpecsSystem Spec
12 Jan 2009   #16

Windows 7 B1

Hi Guys,

Got same problem with bluescreens and ndis.sys but unfortunately I can't rollback NIC drivers (using WDM). Any chance to drop ndis.sys on my PM?
Hope it will solve situation.

Cisco VPN client version
My System SpecsSystem Spec
12 Jan 2009   #17

Windows 7 Beta 1

You may not need to rollback your drivers. just put another ndis.sys in place install the cisco, reboot and replace. try that.
My System SpecsSystem Spec
12 Jan 2009   #18

Windows 7 B1

Hi Dblizz98,

Hmm, ok so let's try once again.
1. Can't rollback my drivers, I'm using standard one included with Win7
2. Where I can find ndis.sys to replace?
3. When I will install Cisco VPN, after reboot, BSOD appears

Thanks for helping..
My System SpecsSystem Spec
12 Jan 2009   #19



I have the exact same problem with you. I can't roll back my driver as well but from google, I found the ndis.sys file is in C:\Windows\System32\drivers.

My System SpecsSystem Spec
12 Jan 2009   #20

7, vista, xp, ubuntu; plus 2003, 2000, redhat professionally

I was successful with installing Cisco VPN client on a fresh new install of build 7000.

At first I failed, getting the NDIS.SYS bluescreen. I went into Repair boot, and reverted to the system state snapshot from before installing VPN, this recovered the computer.

Then I downloaded straight from Cisco. I started a CMD prompt as administrator -- press Windows key, type CMD, when search brings up CMD icon in the menu, right click it and Run As Administrator. Using this administrator CMD window I made a backup of the existing NDIS.SYS file -- but I didn't need it!
Then I used this Admin CMD prompt to start the VPN install. Installed, tested VPN before rebooting, it worked. Then I rebooted, which worked, and tested VPN again -- all OK.

Rick McClinton
My System SpecsSystem Spec

 Cisco VPN issues on Windows 7 Beta

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