Hostname Problem.

[shopowner1234]

Hello.
<background info>

I changed my hostname and then i changed it back
<problems>

Main computer:
I-explorer cant connect to the net sometimes (firefox can)
JAVA goes slow
Holdem poker slow
Multiplayer games goes slow (ping of 999 on local servers)
Laptops:
Cannot print
Cannot file share (i can connect to them)

<System info>
Wireless connection
Xp service pack 2
512 adsl dlink router

Thanks in advanced