It can lock your desktop so that none can use you computer.

Desktop Lock is a powerful computer security software, it locks your pc to prevent others from accessing your private documents or resources, after your computer was locked by Desktop Lock, people will not be able to access your documents, browse your computer, or use programs on your computer. Desktop Lock fully supports all Windows system, includes Windows 2000/XP/NT and Windows98/ME, it is the only lock system software that supports Windows 2000/XP. Desktop Lock provides more features for your use.

Checking Against Virus and Spyware

yes

Operating Systems