Yes: try: Zonealarm at http://www.zonealarm.com and look for the FREE version! (They, of course, want you to buy their for sale version, but keep looking for the free version.)
Yes try: http://www.freegrisoft.com for the AVG anti virus program.
BUT, the recommendation from our technical consultants is that "you get what you pay for" and the price of a purchased antivirus program is the best money you will ever spend and much cheaper than having any one of them remove a virus from your machine.
Some web sites have the capability of taking advantage of a secure connection between the web site and your browser. This may be important to you, for instance, if you are entering credit card information or other personal information at a web site.
To tell if your Internet Explorer browser is viewing a secure web site, look in the lower right part of the window. There is a small box in the frame of the window to the left of the area that describes which Zone you are in (usually the Internet zone, with a globe icon). If you see a yellow padlock icon, then the web site you are viewing is a "secure web site." If the box is empty, then the web site does not have a secure connection with your browser.
Netscape also has a padlock to indicate a secure connection.
Tip-within-a-tip: You can double-click the padlock icon to view the security information about the website.
Before you send something to the Bulletin Board with the question of whether an email you received is true, check out the Virus Information page at: http://www.swfpcug.org/VirusInfo.htm There are links to the major anti-virus companies, sites dedicated to hoaxes and urban legends.
There's no need to pay for a spyware detection and removal tool. Download Ad-Aware from http://www.lavasoft.de Be sure only to download the free one. Don't get tricked into paying for one of their bundles.