first of all, i think PCQuest is a copy of redhat's linux version
so for that it would be easy for moe people here if u specify the above
because not many people know about PC quest linux (as we do in india)
coming to ur problem
there must be intrnet dialer "kppp", internet section or run "kppp" from the command prompt
also "wvdial" is another internet dialer
man wvdial, man wvdial.conf will get u more
also is ur modem detected in linux????