having trouble setting up a dial up connection

hi, I tried to connect to internet the other day and someone has got on here and deleted something.  So i called my provider and they tried walking me thru setting up  a dial up connection again by opening explorier, clicking tools, internet options, connections, then setup but when it got to, set up a dial up connection it was'nt available and she said i needed to reset to default settings.  Is this what i need to do?  And if yes how,  i tried system restore, reinstalling modem with the disk, nothing.  If someone could help it would be greatly appreicated. Its a dell 2200 running xp and the modem is a v.92 56k.  Please help, this pc is fairly new and i cant even get on internet and enjoy.  Thanks again