It happened to me after server upgrade to version 10 ,
but it can be relevant to versions 7 and 8.

You can solve it by editing ofcscan.ini file to bypass server checking.

• To allow upgrade go to your OfficeScan server.
• Open your PCCSRV folder “ by default installed in c:Program FilesTrend MicroOfficeScanPCCSRV”
• Backup your ofcscan.ini file
• Locate the following line [INI_CLIENT_SETUP_SECTION]
  Under LIENT_SETUP_SECTION] find the line “BypassServerChecking=0” ad change to “BypassServerChecking=1”
• Save the file and try to run installation again

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