Are u clearing your cache and runing malwarebytes in SafeMode?
Also, install spybot search & destroy.
Keep all of them updated daily.
If u r using Firefox, install the NoScript add-on and it will stop scripts on pages and u can choose to run them or not.
I have 2 computers with ubuntu, but I cannot use it with my magic jack.
That is the ONLY reason I am still stuck with windblows box.
I hate microshaft and have repeatedly complained to magic jack support to get that linux plugin going, but they don't care about that part of the market share.
The only problem with linux is that it is not user friendly and I wish I would have used it for more years than a few.
For video editing, try KDEnlive.
Here is an intro
http://www.youtube.com/watch?v=1eHEAfNFJ0k&feature=plcp