Hi,
if you follow the following steps .... you will be able to update virus definitions on 64 bit clients...
To manage 64-bit clients with the Symantec System Center
Create a client group.
Right-click the client group.
Uncheck Inherit settings from Server Group.
Right-click the client group, and then select All Tasks > Symantec AntiVirus > Virus Definition Manager.
In the Virus Definition Manager dialog box, uncheck Update virus definitions from parent server.
Do one or both of the following:
Uncheck Do not allow client to manually launch LiveUpdate.
Check Schedule client for automatic updates using LiveUpdate, click Schedule, specify a schedule, and then click OK.
Click OK
After you install 64-bit client software, drag the client computers into this client group.<!-- Reuse end -->
If the 64-bit clients do not appear in the client group, confirm that Symantec System Center is set to show clients in client groups.
To show clients in client groups in Symantec System Center
In Symantec System Center, click Tools > SSC Console Options.
Do one of the following, depending on your program version:
For Symantec AntiVirus 10.x, on the Client Display tab, check Show client computers when viewing client groups.
For Symantec AntiVirus 9.x, on the Client Filter tab, check Show client machines when viewing Groups.
Click OK.
regards
goddie:smileyvery-happy: