Flash Java Not Working In Windows 7 Any Browser / Can't Update

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, Internet, 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 Internet 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) i've tried pretty much everything i can think of, as to manual installation and so forth.nothing works, nor changes anything.

so far it's only facebook (of websites) not working, and then of course flash and java.i would like to avoid comments such as: "just don't use facebook then *hurhhurh*" as the problem runs somewhat deeper than just not being able to use facebook. this computer is just about 4 months old as well, and i'm breaking my skull trying to figure out what the heck is causing this. on a side note i am up to date on both anti-spyware and anti-virus, and i've run several scans in both secure and normal mode.all comes up empty.