Please try the following steps :
1. Click on Start --> Run--> Type services.msc
2. In the services panel, look for "Cisco Systems, Inc. VPN Service"
3. Make a right click on it and stop it.
Please try uninstalling now from add/remove programs.
You may try uninstall them manually from the following Cisco link :
http://www.cisco.com/en/US/products/sw/secursw/ps2308/products_tech_note09186a0080094b7f.shtml