Finally had a chance to try Spacegoose's instructions - works perfectly - many thanks! Not tried rebooting yet though...
Rarmy:
If you log in with Putty,
cd /apps/ca/antivirus
ls
you should see a few files listed including InstallAnitvirus.sh - if not, then you may need the install CD.
If so, follow Spacegoose's steps - making sure you're logged in as su - ie:
cd /apps/ca/antivirus/
./InitAntivirus
./InstallAntivirus.sh /hd/vol_mnt0
Wait til you get the message 'admin: antivirus is installed successfully....'
/etc/init.d/CAantivirus start
you should see the following:
Starting eTrust Antivirus:
[ OK ]
sh-2.04# cd /apps/
If all that goes well, it should work