Due the fact I can't edit my previous posts, I'm posting a new reply even through I don't want to
Anyhow, I have made something work, Both computers can fully access the router and they respond to ping
I have added them to the same thing, "WORKGROUP" and it's set to be the "Work" network type
But the computers can't find each other it seems, and I have no clue why
Useful info (continued):
Desktop PC OS: WinXP SP2