My "D" drive has a red X over it. Why?

A red "X" indicates a disabled device. A disabled device is a
device that is physically present in the system, consuming
resources, but does not have a protected-mode driver loaded.
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That's the Device manager symbol. Does it show in you device manager also.
Can you access your D drive and is that you CD-Rom?
What version of 95 do you have.

No it does not show in my device manager anywhere. I am able to access my D drive and it is not my CD-Rom.  My hard drive is partitioned in to a C and D drive.  My CD Rom is my E drive.

My Windows version is:  4.00.950a

Do you have Tweakui Installed?

Yes, Tweak UI is installed.  If I got into Tweak UI and click on the My Computer tab it shows the D drive is checked but it also shows a red X over it there too.

So far nothing has worked.  My D drive still has a red X over it. I'm not sure where to look for it in cmos.  I see that my C drive is listed there but since my hard drive is partitioned, would I also see a D drive in cmos also?  When I try to edit the msdos.sys like you said earlier I get a message that says, "Cannot edit a read only file".

Use your fdisk /status command on C: drive and D:. it will not fdisk it, that will let you look at it and see if it's reading 100%

Well, I don't remember saying anything about editing the msdos. Please show me that. But here's how, lets say you wanted a menu: try this, I bet you'll like it. It's real good for "Startup Disks".
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Selecting DOS or Win Mode On Startup; A Boot Menu
You can do this in windows, I think Dos is a better way.
Boot and Shutdown To Real Dos Mode
First, configure your system to boot to DOS: At you Dos Prompt
type; ATTRIB -H -S -R -S MSDOS.SYS
Then type: Edit MSDOS.SYS.
In the MSDOS.SYS file, make this changes.
[Options]
BootGUI=0
BootKeys=1
BootMenu=1
LOGO=0
BootDelay=0
After you save and exit EDIT Type ATTRIB +H +S +R +S
Reboot to a new menu.
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The reason you couldn't edit it is because you must remove the S,H,R AND A  attributes.