DON'T REPAIR IT! Google.com finds no mention of Mewwivc.dll, so I'm flagging it as a virus/trojan that uses a random name. For now, if you want to remove an error message about it missing, dive into the registry and delete keys that mention Mewwivc.dll.
I get a message saying Mewwivc.dll is missing when I turn on my computer. Any suggestions on how I can repair this?