Be sure to save all your important data to another media(CD, DVD, or external hard drive) before restarting your computer.
A consumer operating system would probably be quite useless in this day and age without a web browser. A web browser, or at least some method of installing one, should be made readily available to...
At a railway station, a PA (public address) system is used to inform passengers of arriving and departing trains.
Central processing unit, CPU.
find the compromise, eliminate it, secure your data better.