Well, If it was me I would do a clean install. this will take some time but it would be like new. after you use Killdisk then use the 95 CD to install your OS
Download and install procedure of [email protected] KillDisk free version
This program will allow you to do that. It is actually a better format. uses the 0 fill method.
Here is a guide with pics on how to use the program
After creating the floppy or CD shut down the computer.
1.Put the floppy or CD in
2.boot computer it will come to a screen that ask what program you want to use. select "0"
3. That will bring you to the first screen showed in the guide I provided a link to above.
where it says "Fixed" those will be your hard drives installed on the computer. The little arrows under are the partitions. If you want to format the entire drive just highlight the fixed line (just like they have it in the pic.) If you wanted to format a single partition you would highlight the arrow with the partition you want to format.
4. Once you are sure you found the drive or partition you want to format press F10
that will take you to the 4th pic showed in the guide. Type "Erase-all-data" in the box press enter.
That's it. once finished press ESC a few times it will bump you out to Dos A: prompt at that time shut computer down remove the disk from the drive.