Okay, it is not a Vista machine. Lets get in the trenches. I am using older systems and I am not gonna go out and buy stuff.
I tried Ubuntu on my Dell to see if it would change the speed of the machine any. Nope.
So I would rather work inside windows and use tune up programs that are in the Windows realm(but not Windows).
When I installed Ubuntu, I did a full install thing (no partitions, or retaining of old O.S.. I had nothing to save so no biggy.

Now getting back to Windows from Ubuntu 9.04 is not as simple as going to Ubuntu.

And I "have to" go back to Windows98seAor ms-dos because that is the O.S. that I started with (every other disk (Win98se Ver.C and WinXP Pro)are upgrade versions(relying on the purchase Win98se Ver.A). it is a hassle but I get through.

Right now, I changed the bios to read off Floppy Drive A first as I have Win98se setup disk.
My other computers have floppies so I can swap info between them that way as this computer which I am asking with has XP Pro on it. So I can download onto floppies if I need other info and swap between machines.

And I want to put the same pro back on the pc that now is full of Ubuntu

I have nothing in Ubuntu so it can be a full wipe again, no problemo.

However; as I put Win98se setup disk into drive A and do FDISK
:to create a Primary DOS partition
"No Space for DOS partition" is what the pc tells me.
So I choose 3 which is DELETE Primary DOS partition(what do I know?)
Then 4 which is DELETE non DOS partition(which is the majority of the hard drive which I gave to Linux.
It gives me the warnings that can make the best of us paranoid about "impending doom".

but; "this "is"...what I want to do, right?

As it is written on the screen:
Partition info:
1) A-NON DOS 5828MB
2) EXT DOS 322MB
NON DOS will be lost. if you choose (1)

Are you absolutely,positively,willing to bet your first born on it, that that is what you really want to do???

I do, right?

And then the Windows 98setup disk should be able to function. Correct??

Orr, is there going to be some problem with the MBR?
If so, how do I fix that or get information on how to fix that.

I will reinstall Linux, but maybe the mini version so I can work it on the side in the same machine.
For there are sometimes, you just lose patients(bonus for the morgue)(or parts department).especially on hot days.

Thanks for the help. I hope that I was all inclusive in the information.

It is meant to be somewhat humerous but I am serious about doing or asking WTF do I do now?
Grey matter is just getting greyer.

Yes, you do want to delete it. Windows will kindly nuke the MBR without telling you about it in any way at all whether you want it to or not, isn't that nice?

Just sucked back a beer and went "What the he hockey stick duo"

Windows MBR is still there.