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 from.
Errors can happen to anyone. They commonly happen when programs are installed or deleted. Often, many programs do not de-install properly, and may leave behind files that clutter up the registry, looking for a place to connect. This is just one way errors can 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 Regzooka. They are members of the Better Business Bureau so you can trust that they will give you an accurate reading with your scan.