Whether your vista machine in network?
If yes
You can access the vp home folder of the server
Inside this folder you will get clint-inst directory inside of this you will get package for vista
If you install this you will get your vista PC in SSC....
 

If you have installed the client as manged it will come in the SSC.

By copying GRC.DAT and certificate you can make a client manged. Once you make all the pc's as managed then it will appear in the SSC console.....

REF this...

http://service1.symantec.com/SUPPORT/ent-security....

 Just copy the GRC and root cert to the vista machine restart the symantec services. Turn off UAC and WIndows FIrewall and it should show up.

I am running Corporate edition 10 and there is no file that will install Vista version of AV

Yes you are correct, 10.1 is not compatible with vista.

Install only Symantec AntiVirus 10.2 or later on Windows Vista. Earlier versions (10.1 and earlier) will not work correctly and may cause damage to your computer,

Release notes for Symantec AntiVirus 10.2 Client for Vista and Windows Server 2008

http://service1.symantec.com/SUPPORT/ent-security.nsf/docid/2007080911252448

download 10;.2 from https://fileconnect.symantec.com
key in your serial number
download 10.2
first upgrade your SSC , then push the install to clients
install it on vista, you should now able to see all theclients in SSC