Missing hard drive space. i was given an old computer i put an 80 gig hd in it so i reformatted

Question

i was given an old computer i put an 80 gig hd in it so i reformatted the hard drive and installed os, wiht no full version of wom 98 or win 95 i had ti upgrade . first i installed dos 5.1 then win 3.1 then win 98 upgrade win i started to install win xp upgrade error not enough hd space. so i check hd prop it only showed 2 gigs