did you try changing MTU settings in your PC. If not try this:
click on this link
http://www.dslreports.com/front/DRTCP021.exe

and select open when the screens appears, in the window look at...

For the computer to be able to se each other you have to make sure they are on the same workgroup, if you have win 98 or ME go to -control pane-network-identification tab ;
If you have XP just go...

http://www.dslreports.com/front/DRTCP021.exe

Click on that link and a window would come up to ask you to SAVE or OPEN, click on OPEN and you would see another window and at the bottom right hand...