Can you get into windows via safe mode? Press the F8 key as the system is first powered on and booting, then when you get the boot menu, choose safe mode. If it still won't go into windows. Then you could get to that menu again and choose safe mode command prompt. This will get you a c: prompt. With the file on a floppy, type a: and hit the enter key. You should now be at the a: drive. Type this without the quotes.
"copy msvcrt.dll c:\windows\system" and hit the enter key. It should ask you if you want to replace the existing file and you would say yes. Then hope for the best.