I have a Windows XP Pro SP2 Desktop that's connected to a router as PC1.
I have a Windows XP Pro SP2 Laptop that's connected to a router as PC2.

They both have connection to the internet.
I am working on removing some trojans from PC2 via Remote Desktop Connection
and I want to restrict PC2 from accessing the internet and on the other hand
I'd like to connect to it using RDC from PC1.
In short: PC1 should have access to all (internet and rdc),
PC2 should only connect to PC1 and not the internet.
Can this be done?
Thanks in advance.
Gino

Setting an incorrect Default Gateway address should block internet access.
Best to stop the UPnP discovery service as well.