Slow Response on Windows 2000 server

I have two identical databases (8.1.7.0.0), one running on Windows NT & the other on Windows 2000 server(new machine)

The response from the database on Windows 2000 is very slow.
The configuration for both is same.

Could any one explain me why? Are there any patches to applied?
Is it OS problem or hardware problem.

Suggestions would be greatly appreciated.

Srinivas Bethi

DBA

Since we are have also just recently moved our Oracle database from a Windows NT server to Windows 2000, I'd be interested in any thoughts anyone may have on the question posed above.