I am running F2010 on XP, SP3. I increased my RAM to 4 gigs. I don't do the GPO thing, though. I am strictly on the notation side. From what I've gathered from your posts, you would probably want to add more RAM. Going to 2010 is a great thing, too. Once you've adjusted to the new GUI, you'll never want to go back!
BTW, I sent you a PM a little while ago.
PrintMusic 2004, 2006, 2008, 2009, 2010, 2011; Finale 2010b, 2011b, 2012c, 2014
Mac OS 10.9, Windows 2000, Windows XP