Computer freezes with external USB hard drives - jump drives work

I have Windows Media Center 2005 with all of the service packs and updates
current. I have an external Firefly 20g hard-drive (USB powered) and a
Western Digital 120g
external hard-drive (Powered Externally that both had worked on this
computer. Now when I plug either one of these hard-drives in to the USB
port, it will freeze up every time I attempt do this. I tried to find a
solution to this problem via Google and one of the solutions was to run SFC
/scannow. When I tried this, the message asked for the Service Pack 2
CD. I upgraded from Service Pack 1 via the internet and have no such CD.
Anyone have any ideas on how to solve either/both of these problems?

Thanks

 

Incidently, they both work with my laptop!

 

|>I have Windows Media Center 2005 with all of the service packs and updates
|>current. I have an external Firefly 20g hard-drive (USB powered) and a
|>Western Digital 120g
|>external hard-drive (Powered Externally that both had worked on this
|>computer. Now when I plug either one of these hard-drives in to the USB
|>port, it will freeze up every time I attempt do this. I tried to find a
|>solution to this problem via Google and one of the solutions was to run SFC
|>/scannow. When I tried this, the message asked for the Service Pack 2
|>CD. I upgraded from Service Pack 1 via the internet and have no such CD.
|>Anyone have any ideas on how to solve either/both of these problems?

Download SP2 here http://tinyurl.com/5bobl
then slipstream with XP
http://winsupersite.com/showcase/windowsxp_sp2_slipstream.asp

 

Thank you very much, I have download SP2 and will try the slipstream now.
Thanks again for the quick response