When my friend plays online, he has a problem. He times out every time. He dosen't think he has a firewall, but dosen't know how to check for one.

When he used to play with his Dial-up, he had no problems. But he upgraded to Comcast and hasn't been able to join sense. He can't use his dial-up because he dosen't have one. Please help.
Specs:

Prosseser:Pentium 2
Windows 98
Video Card: GEForce 2
Cable modem
Jazz Version:1.23 and 1.24(neither works)