another wifi problem :-(

[xpcpu]

Hi,

i've just re-installed xp pro on my laptop as i had so much rubbish on it

the problem i have now is that the laptop can access the internet via my wifi router but i cannot access my files on my PC.

i have admin rights on both systems, file sharing on, firewalls are set for both.

this is really bugging me as my pc can access my laptop files so why can't the laptop see the PC ?

any help would be greatly appreciated

thanks