Preventing Spywares from Entering your System

Preventing Spywares from Entering your System is not that Difficult.
You should Never Trust a Pop Up that Says your System is Infected or Anything Like that if it is a Message from your Internet Browser. Following are some of the Thumb Rules that can prevent Spywares from Entering your System:
Stop Visiting Websites that offer Cracked Softwares or Other Illegal Activity.
Do Not Visit Porn Related Websites.
Do not Visit Websites that Generate Unwanted Pop Ups.
DO NOT Click on Any Pop Ups that are Generated by your Internet Browser. (ALWAYS Use the RED X on the Top Right To Close the Pop Up)
Avoid using File Sharing Softwares. If you are using them, use it very carefully and Read the "License Agreement" Before Installing those Softwares, as they may mention about other Softwares that are being installed.
Install a Good Antivirus and Keep it Updated Regularly.
Keep your Windows OS Regularly Updated and if Possible, be sure that Service Pack 2 is installed as it also has a good Pop Up Blocker.
Install a Good Anti Spyware like Ad Aware or Spy Sweeper or Windows Defender and Keep it Updated.
Run a Virus Scan using Antivirus at least Once a Week.
Run a Spyware Scan using Anti Spywares at least Once in every 3 or 4 days (If Possible Every Night Before Turning Computer Off).