1 Click Lock Your PC for Windows

For the niche market of PC renting, this locking program could be useful--if users couldn't work around it. 1 Click Lock Your PC's simple interface really needs little explanation.

Configuring the software is easy. You merely choose to enable or disable eight locking options, disabling drives, icons, and taskbars. Setting the rental start date and how often to lock the PC takes only a second. Your customers will be locked out of your PC if you don't supply them with a password at the end of the rental period. Of course, the demoware won't let you generate a password. That makes the program difficult to test.

The downside of this software is clear. You must install it to an administrator account. Booting from something other than the hard drive allows easy access to the user's files. Purchasing the program gives only a 365-day license, though you're allowed to install the software on as many rental PCs as you wish. Difficult to completely test, not tough to work around, and geared only to PC rental companies, this program isn't recommended for the majority of users.