The following are links to a "how to" for a variety of common computer maintenance tasks you should do on a regular basis to keep your PC running at its best.
Clear Your Cache
Clear your Browser Settings
www.free.avg.com - Make sure to have Anti-Virus protection, AVG offers a free Anti-Virus that easily compares to the top of the line, for pay Anti-Virus software.
www.iobit.com - IObit has numerous security software on their site, including Advanced System Care, a one click solution to many PC maintenance issues.
www.malwarebytes.org - Malwarebytes is an Anti Spyware/Malware program, that is useful in getting rid of nasty infections.