Let me see if I can help. I certainly cannot teach you DOS in this post but
here are a couple of things. 
DOS only recognizes the 8.3 naming format. That means that any filename longer than 
8 characters with a 3 character extension will be truncated to 6 characters ~ and 
a number, then the extension.
tmlshell32.dll is 10 characters so it will be tmlshe~1.dll in DOS because it
is the first file in that directory that starts with those 6 characters.

In the commands below I will use _ to designate a space.
When you type in DOS, upper or lower case does not matter.

CD is the change directory command.
When you reboot to DOS you will probably be in C:\windows.
    Type:  CD_SYSTEM to change to the C:\windows\system directory.

RENAME is the rename command.
    Type: RENAME_SHELL32.DLL_SHELL32.OLD
    Type: RENAME_TMLSHE~1.DLL_SHELL32.DLL

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