I'm really not the right guy to answer this, but have you tried upgrading to 2.5.3046.k9? perhaps use the version with DART to help you troubleshoot.
description of issue from http://www.cisco.com/en/US/docs/security/vpn_client/anyconnect/anyconnect25/user/messages/ac25-vpn-user-msgs.html
Hostscan Initialize error.
Description Host Scan could not launch. Possible causes include the Host Scan executable stub as well as the Host Scan initialization routines.
Recommended User Response Report the issue to your organization's technical support.
Recommended Administrator Response Open a case with the Cisco Technical Assistance Center (TAC).