Pulling up previews very slow...

Running Peachtree 2009 on a 2008 Small Business Server, clients are XP, Vista & Windows 7. I am also running Trend Micro's Worry Free Security on the server &
clients computers. Users have been complaining that pulling up previews are painfully slow. Is there a place I can start or settings to check to start troubleshooting this? I don't believe any folders are excluded from AV scans, but even if they were, would that affect this? Any advice appreciated.
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