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Unwated Adware and Spyware are stealthly installed in many ways. It can come with an email attachment. It can comes with a downloaded software. Here are a few potential ways in which spyware and adware may find their way get onto your computer.
Spyware and adware may be included (bundled) with programs you download and install. For example, a free audio-MP3 converter freeware may includes a compoent which sends your privacy information out when you are online. So you must be careful before downloading software from Internet. Especially when you want to download a cracked software from a cracker website, think about it before clicking the download link.
When you receive a spam email, the good action to take is to delete it from inbox directly without opening it. The email with a virus, adware or spyware attachment usually has attractive content to lure you to click the attachment. Once you click it, Virus, adware and spyware will be installed in your computer.
Browser is the most frequently used program comparing all others. Browser is also the most popular attacking point used by attacker. Researchers always look for new vulnerabilities in Microsoft IE browser and published them in Internet. Most of them are utilized by attacker as the way to break into users' computer. For example, if you use a IE browser which has security hole and browse a cracker's website, clicking a attactive link may get a script running in your local computer. As a result, the virus or spyware will be downloaded and installed.
Once the adware and spyware are installed in your computer, it is hard to clean them 100% for most of users. Also some adware and spyware have bad quality and bad stability which result in frequent system crash or slow performance.
You may voluntarily but unintentionally install spyware or adware when you obtain some tools from Internet. Often times, spyware or adware appears to be corrective software or a special plug-in that will help you view a site. If you don't know the source of the download or aren't sure what a program does, you can generally learn more by searching on the name of that program in Google Search.