Windows 7: Flash Java not working In Win7 Any Browser - Can't update

I've had this laptop a little less than a year. I had no problems until about three or four months after buying it. I only ever use Firefox, and would always keep it and other programs such as Flash and Java up to date. One day, some websites just quit working, like facebook, youtube, netflix, and various game sites. This problem continued for a few weeks, and I didn't do anything to try and problem solve it. Then everything seemed to magically fix itself, so I figured that an automatic update had done the trick. However, a few months ago those problems started again and since then I have read many threads on how to fix them, uninstalled and reinstalled FF, Java and Flash countless times, including past versions of all of them. I even tried using IE and Chrome, but I had the same problems with those browsers. As of right now, I cannot view flash based game sites (such as omgpop). I used to not be able to play games on facebook, but as of yesterday those suddenly work again. I cannot watch streaming videos on netflix, but youtube works fine. I cannot view content on many web pages (for example google images does not work at all, nor does googlemaps or mapquest). Some pages only load partially even though it says they are 'done'. I often see 'javascript:void(0)' on websites. Currently I am running the current versions of Java and Flash and FF 3.6. I have checked pop up blockers and script enabling and just about everything else. I am at a total loss of what to do. (Even as I am typing this, I cannot click on any of the text editing tools or smilies and this is showing up as one big paragraph...)

Sorry your having problems.

I had a problem with Flash Player on another PC & this worked.
Adobe Forums: How do I do a clean install of Flash Player?

I don't know if you have tried any of these sites or not
unable to go to facebook - Google Search