Use spyware protection software before installing these files. Once your computer is infected, it may be very difficult to remove all the junk. Spyware can slow down your computer, cause your computer to behave erratically and even crash. If you really want to look for free screensavers, please do your homework and use spyware protection before installing. Some websites may even claim that their files are spyware free, but they're not.
What types of files do you look for?
Usually the screensavers will come in the executable .exe extension or .scr extension. If you can't see the file extensions, make sure you have "hide extensions for know file types" unchecked in your folder options. You can reach there by going to My Computer, then "tools", then "folder options", then "view". Both of these file types have been known to be used for distribution of malware (malicious software). Be especially cautious of files being sent through email. Do not open any files sent through email by untrusted sources. Even friends that are ignorant to these schemes may send you infected files. Again, it is your responsibility to use spyware protection to protect your PC.
Why would anyone add spyware to screensavers?
To make money of course. They are easier to make than regular software and can be easily distributed to PC owners wanting to decorate their screens with nice pictures and effects. The creators of screensavers partner up with companies that add extra code to their files so that whenever someone installs them, the company will pay the creators a few cents. Once the files are installed, spyware is also installed. These companies will track any info in your PC that they think they can use. They will use popups, change your search results, and steal money from affiliates that actually worked hard to promote products that you decided to buy. How low can they go? It doesn't matter to them as long as they're making money even if you have to pay for it.
Are all free files infected?
No not all are infected and you can probably find them if you look hard. Just be cautious and use spyware protection whenever you can. It would be better to pay a few bucks for one you really like or make your own. There are plenty of tools out there that allow you to do this.
I am infected, now what?
If after reading this and you discover that you are a victim, I suggest you look for spyware protection software to clean up the mess and prevent future spyware from being installed. Now that you have been educated, stop downloading free stuff so liberally without spyware protection and if you are a creator of free software, please just stop dealing with those scum companies. They make millions while they pay you a small change to help them distribute their spyware, all the while hurting users along the way.
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