Security scan failed, it says lost contact

Hi,

We have around 100 servers with windows OS (2003, 2008), in that only 4 servers are not getting security patches. During scan, server says lost contact and fails detecting security updates.

I can see below error in vulscan.log

Subject to session 0 isolation

Wed, 12 Mar 2014 02:55:04 2640 4948 C:\Program Files (x86)\LANDesk\LDClient\vulScan.exe version <9.0.3.7> started

vulscan.dll     version: 9.0.3.80

ldredirect.dll  version: 9.0.2.2

lddwnld.dll     version: 9.0.3.22

rollinglog.dll  version: 9.0.0.473

Command line:

Platform Major Version: 5

Platform Minor Version: 2

Platform Build Number: 3790

Platform Platform ID: 2

Platform CSDVersion: Service Pack 2

Processor Architecture: 6

Platform Product Type: 3

Unrecognized platform operating system.

Wed, 12 Mar 2014 02:55:04 2640 4120 Exiting with return code 0x8db301b6.

Kindly help me with this.

Thanks,

Roopini