Hi,
50% for two days is too bad, i administrator a bigger network than your and we have standard of about
90% - 95% for 1 day
85% - 90 % for 3 days
The reason for this is if at all you have a threat on you network and symantec has a defintions released for it within a dayin that case you will only have 25 % - 50% on your systems clean what about the remaining?
I deal with a only 64Kbps, if i can do in mine you definetly can do in yours.
Antivirus software protects us based on definitions if we have the older it gets the bad its for your environment.
Hope this helps, keep us updated.