Shut down and unplug the computer. Remove the CPU case lid. Locate the various fans, and then use compressed air to blow dirt out through the internal slits from inside the case. cleaning the fan

Save files to an external storage device to aid in file recovery.
backup

This process allows you to permanently delete files you no longer need.

This mini program may be an unwanted application.

Remove programs you accidentally downloaded when you purchased an e-book.

This application scans, locates, and makes needed repairs on the hard drive.

Ithink it is a thermometer.

For question 1, i'm a bit stuck between serif fonts or large enough type to read. serif fonts are good fonts to use because their easy to read. but you also need your type be large enough to read. if i had to say what you need to consider most important, i would say d is the answer.  for question 3, i believe the answer is d. it seems most appropriate to do that. on every page or every other page would be too much, and only on the contact page just seems inappropriate.  for question 4, it's probably a. by "color scheme" it doesn't mean just one color, but a set of colors. colors that are complimentary to each other. having too many is too distracting so it's best to limit it as much as possible, but not to the point where your website looks dull.hope this !