It has been reported that upgrades to version 5.0.01.0600 of the Cisco VPN Client in non-English versions of Microsoft Windows may fail. This issue is being tracked by Cisco Bug ID CSCsj89801, and Cisco has made available a workaround in the form of an MSI transform, which is available from http://www.cisco.com/pcgi-bin/tablebuild.pl/windows?psrtdcat20e2 ( registered customers only) (file name vpnclient-international-transform-5.0.01.0600.zip). Future versions of the Cisco VPN Client for Windows will not require this workaround.
Above issue with install while being connected to a Domain appears to be rectified in later versions (5.0.03.0560) and above. I had the same problem with the older English version. You can deploy with standard msi commands.
use this, it works no problem
msiexec /x "vpnclient_setup.msi" /q /norestart
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