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is that any webpage is made up of many component parts, collected often from many places. try, on this page, top bar-view-page source, for instance! you will see hidden instructions to your pc to garner stuff from other places to give the finished appearance.
any break or glitch in those hidden actions on any page might cause a "tilt" in ones pc. dodgy sites may have many such hidden actions!

it may also be worth your while checking that your java is up to date, as many correctly completed pc actions depend on that;

http://www.java.com/en/download/installed.jsp

just go to that page, click the verify button, then follow the instructions, don't bother with the extraneous adverts.