If you are login to your Computer using a user name with high privileges (such as Administrator or power user) then Computer viruses can easily install their infected programs automatically. The best you can do is to create a Windows user account with lesser rights and use this new user account for your day to day work. Here is how to do it in Windows 7.
Log-in to your Computer with an Administrator (or equal) user account.
Click START button and then Control Panel
Click the “Add or remove user accounts” link under “User Accounts and Family Safety” section.
Then click “create a new account” link.
Enter your logon ID in the “New account name” field.
Make sure to select “Standard user” radio button (option).
Click the “Create account” button.
Never open an E-mail with an attachment you were not expecting.
The latest batch of virus programs are often spread by E-mail. Even if your anti-virus program does not warn you about the attached file and even if the eMail appears to come from someone you know, do not open it if you were not expecting it, and if you were expecting it, only open it AFTER scanning it with your up-to-date virus software.
Scan ALL incoming email attachments (regardless of who sent it).
Be sure to run each attachment you plan to open through the anti-virus check (you can configure your anti-virus program to do this). You must do this even if you recognize and trust the sender; malicious code, like Trojan horses, can slip into your system by appearing to be from a friendly source.
Turn off the 'automatic preview' in your email program.
Automatically previewing an email message has the exact same effect as opening and reading an email. My of the newest internet worms, trojans, and viruses simply need to have an email message read in order for them to be activated. Turning off the preview feature allows you to scan any email BEFORE you actually read it.
Don't share removeable storage devices such as USB flash drives.
Even a well-meaning friend may unknowingly pass along a virus, Trojan horse, or worm. Label your storage device clearly so you know they're yours and don't loan them out. If a friend passes you a flash drive, suggest an alternative method of file sharing.
Scan external storage devices before using them.
This is always important, but especially if you are using the disk to carry information between one computer and another. You could easily pick up a virus from an insecure network and introduce it into your system. Running a virus scan before launching any of the programs on the disk will prevent infection.
Keep your web browser set to its highest security level.
Its a pain to get the warning messages on every other web page you visit, but its the best way to protect yourself - especially if you use Microsoft Internet Explorer and Outlook.
Don't download programs from the Internet
Unreliable sources such as Internet newsgroups, social networks or Web sites that you haven't heard of may be willing providers of viruses for your computer. Avoid downloading files you can't be sure are safe. This includes freeware, screensavers, games, music and any other executable program - any files with an ".exe", ".pif",".htm", ".html", ".js" or ".com" extension, such as "coolgame.exe." Check to see if the site has anti-virus software running on their side. If you do have to download from the Internet, be sure to scan each program before running it. Save all downloads to one folder, then run virus checks on everything in the folder before using it. Regardless of where you download from, ALWAYS scan downloaded software. Back to Antivirus Help from How to Avoid Spreading Computer Viruses
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