Newbie to fedora/linux

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Hi,

    I was wondering if anybody could help.Im a real newbie at

linux and dont know much about it.I installed fedora core 3 with

\windows xp sp2.and am currently trying to get my speedtouch

adsl 530 modem to work but everytime I try create a folder to install

too it tells me "I cant create the folder I dont own the computer"

or something like that.I tried to find administration tools within fedora

but couldnt what am I doing wrong or do i need to re-install fedora

 

Steve