how do i retrieve my partition on hard disk

i formatted my hard disk n than partitioned it in 2. than i installed winnt, but not quite sure on which partition. after a while i installed windows 98 not sure on which partitino either. now when i start my system it starts windows 98. how can i can choices of menus where d system ask u whihc OS u wana run. now if i wana delete windows NT, would it be possible to have dat partiionted HD space added to my partitioned windows 98 HD space. i mena i had 4 GB, 2 Gb i used bu NT n 2Gb by 98. if i delete on partiotn will my HD b 4GB or will the HD space remian in its partition. sorry for d long question n hope u understand what i have written.
thanx guys, i know u ppl HAVE d solution.

Well if its booting into 98 its probably on the c: drive and since you installed it last it made itself default OS so it wont give you the boot option screen. You can take NT off and give that space to the 98 partition but youd have to fdisk again if you didnt use a program like Partition Magic.