Something could have been corrupt during the install. Try uninstalling the Client manually by the procedures below and reinstall the client.
1) Open REGEDIT
2) Remove the following keys:
HKEY_LOCAL_MACHINE \SOFTWARE\Cisco Systems\VPN Client
HKEY_LOCAL_MACHINE \SOFTWARE\Deterministic Networks
Sometimes the system might not allow you to delete this key.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\
{5624c000-b109-11d4-9db4-00e0290fcac5}
3) Delete the following directory:
C:\Program Files\Cisco Systems
C:\Program Files\Common Files\Deterministic Networks
4) Delete all the old DNE files
a) dne2000.sys from %SystemRoot%\system32\drivers
b) dne2000m.inf and dne2000m.pnf from %SystemRoot%\inf
c) The oem enumeration of the dne2000.inf and .pnf files.
The oem enumeration .inf file is a file called oem (some
numeric value).inf. For example oem2.inf and oem2.pnf.
Be careful to only remove oem files from DNE.
d) dneinobj.dll from %SystemRoot%\system32. You may need
to reboot before this file can be removed.
5) Delete the following file:
a) cvpndrv.sys from %SystemRoot%\system32\drivers
Reboot the machine and install the client.
