If you get a popup window that looks like this below, follow my examples to get rid of it, if you do not understand it, just turn hold in your power button on the
PC for 4-6 seconds until it turns off completely and then turn it back on, should be ok then. DO NOT touch or click on these popups at all, it will automatically install the bogus software onto you PC and it is very difficult to remove! If you already have it and it keeps asking you to pay to fix your PC it is too late, it will need to be reapired, if you do not have it repaired soon, you will eventually not be able to use your computer anymore!

 Hope this helps save you all a repair bill!

http://www.teamviewer.com/en/download/index.aspx