Looking for an anti-virus software free or commercial that minimizes the impact on the user when the anti virus is performing a real time scan or when doing a full system scan.
Background: At work we are encouraged to switch our computers off at the end of the day but once a week IT still want to perform a full anti virus scan of our computers (they wanted to run it more often but I got them down to one). They have the scan scheduled at lunch time but sometimes I still want to work but the whole machine grinds to crawl. There is an option to pause the scan but you still need to find an hour and half at some point to run the scan and not be able to work.
We currently use EST NOD32.
EDIT: Found this question which gives a list of free anti virus software, but I'm after something a little more specific. It must minimize the impact on the user doing real time scans and once a week full scans. (I've clarified the above question to indicate this)