Windows – Uninstalling Cisco VPN Client on Windows 7 RC causes machine to BSOD. How to uninstall it

This depends on the VPN server on the other side too. Older VPN Concentrators use a different protocol (IPSec over UDP/TCP) while AnyConnect tunnels through HTTPS. So it may be a configuration issue on the server side where HTTPS might not be enabled or the server is simply too old in which case you're out of luck.

There are third-party clients that support connecting to Cisco VPN servers, such as

• Shrew Soft VPN Client. I killed my machine with that back in last January, though. But maybe they have Windows 7 support by now and don't blue-screen anymore.
• vpnc which supposedly works on Cygwin too.

Delete the Cisco Systems folder in your program files. That's the best you can do.