Here is a note from Frederick on the UF main list:

"This has been a persistent problem with various anti-virus packages in the last couple of years. To work around it, in version 5.04, I've completely removed the Server.exe program and replaced it by an additional shortcut in the Start Menu. If you have upgraded to version 5.04, the Server.exe program from earlier versions will still be there, but you can safely delete it so your anti-virus software will no longer complain."