You really do need to install SP2 for your XP. There are significant changes to the OS (not to mention that even SP2 is 4 or 5 years old). Get that update installed, and then we may be able to help you a bit better, as we'll all be on the same "page" (I run a dedicated BS server using XP Pro and BS 5.1.0b25).

Cheers

Nick

PS - Install any new routers lately? They can and do block Gnutella traffic.