What kind of proffesional am I looking for to solve this
lol, after reading all the threads on this so far, i think you are gonna need someone with a big hammer.
seriously though, in your threads you say the problem only exists when you connect via the wireless link.
can you change the wireless network card with one of the pther pc's or is it integrated into the motherboard?
if it is integrated, you could try a new wireless network card in a free pci slot (i know its more expense but it might solve the problem)
is the new pc a client on the network or the server?
if its the client then you might need to check all the settings on the server pc (we have internet on our workstation at work but can ONLY connect to our own companies web site, due to restrictions placed on the server...several other pcs in the factory have full internet access). This problem points at the settings for the wireless connection on your pc (you can connect properly through the crossover cable) OR the server is blocking access to any secure sites.
maybe the server pc firewall is restricting your access, maybe its just a badly configured network.
i have two pcs networked, the client pc can only access the internet if Zone alarm is first shutdown on the server pc (windows xp firewall kicks in to protect me), once connected i can fire Zone alarm back up and its ok....thats a problem with Zone Alarm (only happened since last update)
good luck with this, it seems to be blowing your mind.
as for which professional to go to.....i would think it would be a networking expert but i may be wrong.