MSVCIRT.dll

I get the following message when I try to do several things "The MSVCIRT.dll is linked to missing export MSVCRT.dll:??_u@yapaxi@z." MSVCIRT.dll is in my Windows - System directory. I have tried replacing it with one I downloaded. I am sure I uninstalled something that caused this problem but I do not remember what it was. Help!

Please don't tell me you've got AOHell. Seen this before with aol upgrades.