Okay, some more info needed:
Please tell us what browsers you have used and what versions they are.
Tell us whethe you have had any Windows Updates downloaded recently.
Tell us wether you have Java installed on your PC and wether it is still enabled in your browsers.
If you need help with finding this info, please let us know.
(BTW- as it says next to the title box when you make a new thread, please make sure that your title describes your problem. Avoid using things like "please help" because we won't know wether we can actually help until we read it)