The Logic Off Topic list

I currently have a problem with my 5.5.1 system. Intermittently 
while playback and recording, the system hangs and playback stops, 
some notes stay on. 
I have to turn off the amt and unitor 8's exit out of logic and 
restart logic. Than all works ok. 

The question is, I can pick the operating system but which one is 
reallt the most appropriate fit for 5.5.1.
Is it 
Win 98 SE (End of support for Windows 98 Effective July 11, 2006)
Windows 2000
Windows XP
Windows XP SP2

Things started hanging when I began using the following 
configuration: (Thanks)

Logic 5.5.1
Windows XP (SP1)
Big Ben Clock
DM-24 (Tascam)
AMT 8
MOTU 2408 MK III

Connected:

GigaStudio 3.1
Windows XP (SP1)
Unitor 8
MOTU 2408 MK II

Logic Control
Logic Control XT.