HELP! networking between 2 computers..

I dont know what I did but while I tried to see and manage the files on my 12"PB from my Desktop PC, I changed many settings both in PC and PB and I lost my internet sharing settings that I had before changing file sharing settings..

for the first time I had plugged the cross cable to my PC and PB, I didnt have changed any settings and it worked just as I plugged, but today after changing file sharing settings, I lost my internet sharing.. Plus, now I cant play Diablo with TCP/IP multiplayer...

I restored my PC original settings by "system restore" so the problem has to be with my 12"PB..

anyone who knows a solution?

is there anyway to restore my settings (go back to old settings) in MacOS X 10.2, like System Restore in WindowsXP does?

in system preferences/network

-TCP/IP Tab-

location:automatic
show: Built-in ethernet

TCP/IP
configure: Using DHCP
IP Address: 169.254.85.201 (self assigned)
Subnet Mask: 255.255.0.0

Router: (empty)

DHCP Client ID: (empty) (optional)

Ethernet Address 00:0a:95:2f:16

DNS Servers: (empty)
Search Domains: (empty)

-PPPoE Tab-

I dont use PPPoE

-AppleTalk-

I dont use Apple Talk

-Proxies tab-

I dont use proxy

any comment?!..