I have noticed over the last couple weeks that we are having problems in our network. We are so small that we don't have any IT people so I am trying to fix it myself. We have a server set up in a RAID5 setup running Microsoft Server 2003 and two pcs connected to that server. They are both running Windows XP Service pack 3. Our sales program and production management software are accessed on the server by remote connection from the pc's and we are not having any trouble at all with those programs. However, we use shared files (mostly Microsoft Excel) from the server which is where we are having trouble. It suddenly started about 2-3 weeks ago which made me think it was a virus. Both pcs are running AVG8.0 and scanning nightly. So far no viruses have showed up. Here is the problem as best I can describe it. We have about 6 Excel files that we use all day everyday. They usually are kept open on my pc and accessed as "View Only" on the other pc. For 7-8hrs per day, the program runs fine, but after that we get an error when we try to save the files. It usually says Could not save because of a sharing violation and that the file is in use by ##### which is my user name. I can save the file to the desktop and restart the computer and everything will work fine. I tried to trace this down to see if it was a certain time of the day or certain length of time the file was open. So far I cannot pinpoint a time but it is usually mid-afternoon and then again at night (since I leave our computers on overnight to perform backups.) I have noticed that the file does not even have to be left open. i.e. I have left the computer on over night but had the files closed and when I came in the next morning trying to open the Excel files I got the same kind of error, that the "s" drive was not available. Restart the computer and everything is fine again for most of the day. Anyone have any advice on where to start? Thanks!