Here are a number of web sites that I find useful!
Answers That Work - A generally useful site with lots of information. The Task List is a way to look up tasks that are running on your computer to see if they are legit or not.
Microsoft Support - Look up problems with Microsoft software.
Google Newsgroup Search - Search the "bulletin boards" of the internet, where people ask and answer questions. Someone else may have had the same question that you have.
Google Web Search - No need to explain this.
Symantec/Norton Virus Library - Look up virus info on symptoms, removal, etc.
McAfee Virus Library - Similar info provided by McAfee.
Eisenberg Research - Process development and improvement services to the food and chemical industries
AVG Antivirus Free Version - a free antivirus that I have used extensively and found effective. Do be careful because they try to get you to install a trial of the AVG Internet Security, which is a paid version.
Microsoft Security Essentials - Another free antivirus program from Microsoft. Also very effective, and is the basis of Microsoft Defender that is included with Windows 8.x.