t02100.dll is a process that belongs to the t02100.dll Module program. Have you turned on your computer only to find this file come up as an error? This file may be a legitimate file, or it could be virus. The only way to know is to find out which directory the file originates.
Errors can happen to anyone. They commonly happen when programs are installed or deleted. Often, many of the files deleted belong to one program and is shared with another program. This is one way errors occur.
To correct this, you can use a registry cleaner such as ZookaWare PC Cleaner. ZookaWare PC Cleaner can fix errors with the first scan. They also offer a complimentary scan, so you can find out if you even need to purchase ZookaWare PC Cleaner. They are members of the Better Business Bureau, so you can trust that they will give you an accurate reading of your scan.