MS-DOS is the primary way to go here. If you boot into MS-DOS the cd-rom is inaccessible indeed, but the a:-drive should be active. It's very strange it isn't.
The other way around then. Get your EBD (Emergency Boot Diskette), or make one with a program you can download from www.bootdisk.com. Then go into the BIOS and set the machine to boot from a: first. Then boot and choose CD-support. Note the driver-letter the cd gets. It won't be d:, and can be anything from e: to z:.
Then put the cd in, and use MS-DOS copy command like in
>copy r:\msvcrt.dll c:\windows\system
if r: is the drive letter for the cd-rom and you burned the file into the root folder.
Hope this helps.
I was recently cleaning out my computer to free up space. I accidentally deleted a vital .dll needed for the computer startup. This file was called MSVCRT.dll and I cannot access the main screen of the computer. When startup is about to finish, it says to reinstall Windows 98 SE and then the screen freezes. Because of this, I cannot access "my computer" to reinstall this .dll that I need. I have tried a using different cd-rom drive and I have even tried to use dos mode to manually reinstall the .dll. I have a second computer so I have downloaded the .dll into both a floppy disk and a cd but as soon as I entered dos mode, the A drive(floppy), the E drive(cd-rom), and even the D drive(cd reader/burner) all go offline.