Please please please please please please help me fix my windows 98!!!!!!!?

first things first. i have tried to restore it to its factory state, but found no way to do so. and a guy on yahoo answers told me there was no system restore for win98.so then i asked if i had to wipe my hard drive or not.which it turned out i had to do that as well. so i made a noobish attempt to wipe it by pressing ctrl-a in the c:\ drive and pressing delete.(please dont laugh) now my system wont start! when i do, it comes up with a message saying invalid system disk. please reaplcethe disk and press any key. so i put in the win98 boot floppy and the win98 setup disk and presses a key. then it came up with 3 choices saying start windows 98 setup, start pc with cd rom support and start pc without cd rom support. if i try the first choice it says it cant install win98 because i already have an operating system installed. the last two choices come uo with a command prompt. pleeeeeeeeeeeeease help meeeeeeeeee!