FS2004 Maximize problem Vista 64bit

Hi guys, i just installed FS9 on my computer.. i have had it on here before and never had this problem... I can't remember clearly if i had this problem and someone great here helped me with it, But either way when i am on FS9 and i minimize it to do something else and i click back on FS2004 on the taskbar nothing happens, it does not open back up.. If i push ALT - TAB its not even listed there to open back up.i hope someone can help me.. Many thanks..Mike