Shake may infect the same program over and over, and infected programs may cause a reboot when executed. The name is derived from a string which is found inside the virus:
Shake well before use !
This message is occasionally displayed when an infected program is run, followed by termination of the program.
Allow F-Secure Anti-Virus to disinfect the relevant files.
For more general information on disinfection, please see Removal Instructions.