I see all the answers of the other folks who are still thinking 'inside the box' that Microsoft and 'Trusted Partners' have built to trap you all in their money spending world.
I have a FREE recommendation, to avoid all that energy expenditure, time wasting, and money spending effort.
Switch to using something FREE, that is totally immune to the "114,000 Microsoft Virus Definitions"!
Why would an operating system made in 1999, and repeatedly rebuilt by thousands of expert programmers, still suffer from those 'weaknesses', unless the vulnerabilities were earning money for the inventor(s) and their friends?
There are over 800 OTHER Operating Systems, that are totally virus free, which Microsoft and their "trusted Partners" all use to operate their corporations, and the Internet, that they get for FREE!
Berkeley Software Distribution, aka BSD, is a clone of Unix, now available in a dozen different offerings (icluding Mac OS X). But, we don't really need to purchase all that new hardware, when we can get FREE stuff that runs upto 50X faster!
Sun Solaris, GNU/Linux Distros, are other Unix clones, available for FREE, also.
Microsoft runs 45,000 FREE copies of Linux on their computers for Microsoft.com, MSN.com, Hotmail.com, and their Redmond Campus.
Yahoo.com runs totally on FreeBSD. that is FREE for the download. Google.com runs 100,000 Linux computers clustered to act as super computers, for very fast response to individual searches!
In fact, 80% of the Internet, and all Universities, 165 national governments, the entire Fortune 1,000 corporations, run one of the 800 virus free Operating Systems, that are FREE on the Internet! They all think 'outside the box'! Join them!
Just get a FREE download, burn the CDrom, reboot it so it runs in the RAM 'disc', to let you see how easy a solution it is, OUTSIDE 'the box' that Microsoft built!
If you like, you can install it, after you back up all your user files,
with a single click on the 'Install' icon!
You can run it for weeks, in the CDrom, while you decide. It won't crash. Millions of geeks have stress tested it. My Third Grade Class approves it!
Also included are more than 1900 popular games, programs, applications, suites, on the FREE LiveCDrom. Installed, it opens up a pantry of 5500 free games, applications, etc.
So, if you are annoyed enough with the unwanted pop-ups, virus, etc. you need to get this and play with it. And, remember, any typical third grade student can do this, so it can't be too difficult for an adult!