I could say never or I am infected right now. How you define malware? What you think about Digsby for example
http://lifehacker.com/5336382/...-your-pc-to-make-money I use that but I use alternative download without all the crap so Im supporting/using software from a company which motives can be questioned?
Lifehacker article is pretty much BS btw. They have written about, and LOVED Digsby, many times and just now figured out what really does happen when we click install? Month ago I saw a video of whole install process by a German guy - he called it snuckware, dont think it is a positive label
http://vimeo.com/2350704 They probably did a search on Vimeo for digsby found his old discovery, oh Nooo or rather hmm worhty of a screaming article!
If you use Digsby, is annoyed but also love it!, then uninstall and use link at the bottom of this page
http://www.digsby.com/download.php?os=win After its done go to help, support digsby and here you can turn off "conduct research"
http://i27.tinypic.com/2hf2j5h.jpg So all is good and most will be fooled , why malware is hard to define. Some will say use your brain! other than every process must be transparent. A pre-selected tickbox installing toolbars and such is not transparency. When is that the case anyway? Digsby are fairly open about this btw - see their forum or blog
http://blog.digsby.com/archives/68 However they dont reveal which services they use users computers for, can be for charity, can be for money.
Another example is Sumo
http://www.kcsoftwares.com/index.php?sumo a much praised update checker who also went to the "dark" side with a Relevant Knowledge offer. Malwarebytes will get that! Well, they also have a "lite" Sumo - not the one majority use. Guess RK can also be unselected but many just click.
Have been infected many times when I used not so legal software, but behind my back, without me knowingly playing a part, I dont think Ive ever been infected. Has not much to do with software running in background. Not really difficult to avoid but certainly depends on definitions. One of the most popular antispyware scanners highly suggest a simple tracking cookie is a threat so may be Im infected 24/7