hi guys i have got a serious problem

i cant open my computer or network neighbourhood (win98).when i try to open, the system reads for some time and then get hang.(no windows popups) I have avg installed and updated, i tried some trojen removers, anti spywares/adwares , even reinstalled windows-but did nt find any success.

But i can browse my computer from internet explorer window (stangely .....). When i tried using run menu it didnt work

Plzzz help

zid