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How to maintain your computer
Clean out all the junk left behind by browsers.
To do this, you can use the disk cleanup utility included on the windows systems, or download a freeware program such as ccleaner to do it for you. In linux you can use kleansweep or bleachbit.
Cookies and cache left behind by browsers can amount up to gigabytes of wasted space, so it is imperative they're deleted. Search and destroy spyware and/or viruses on your pc.