Have done the usual extending pagepoolsize etc but has not helped. Have seen that this error usually arrises when I log onto file the server in question - loading the rdp profile/session seems to then exceed the pagepoolsize and knock the server service out. I have tried Trend for a fix (the one above was suggested, but had done this already). Anyone with some ideas on way forward here (aside from removing the AV that is). I did run with AV disabled for a period and the issue did not recur.
Thanks for your help.