Check the back of the computer and see if the below device is there. If so, do not use it!!!!
These devices are generally known as "key loggers". The brand of keylogger shown in the message is a KeyShark Key Logger and is available for sale at many different computer outlets and websites around the world.
Product information about the device describes it as follows:
This is a device that can be connected to a keyboard to record all keystrokes. It has a changeable password, keyword search, enable/disable option, and stores over a years worth of data.
Keyshark plugs in between your keyboard and your computer. A microcontroller interprets the data, and stores information in the non-volatile memory (which retains the information even when there is a loss of power.) This means that the Key Shark device can be unplugged, and the information will not be lost.
All in all, however, a much more potent keylogging threat to users exists in the form of software keyloggers. Software keyloggers, which can perform the same function as hardware devices such as the Keyshark, are much cheaper and can potentially be installed on a great many more computers. Keylogger software in the form of trojans horses can be installed on thousands or even millions of computers via malware email campaigns that cost the criminal very little to implement. Therefore, it seems probable that serious criminals are considerably more likely to operate software keyloggers than use the more expensive and cumbersome hardware variety.