There is no virus by this name. Distributed.net is an organization that distributes a client that can be used to calculate huge calcutions when a large number of machines is running the client.
Some users have created trojan horses to drop this client to unsuspecting users, effectively using their machine for their own needs.
For more information, see:
Disinfection & Removal
Earlier versions of F-Secure Anti-Virus detected Bymer worm as 'Worm.RC5'. The description of Bymer worm can be found on our virus information pages:
The RC5 client's name dropped by Bymer worm is DNETC.EXE. In case you have Bymer worm infection, you have to delete both worm's file and RC5 client from your system. See Bymer worm description for more info.
[F-Secure Corp. Virus Research Team, 2000-2001]