Webpage closes on entry - flash problem?

When I go to open certain webpages - doesn't seem to be anything in common that
I can see, (but then I don't get to open them, either), they close down the
browser. Has happened at WWBIC homepage, when I went to open an ecard, and
just whenever.... Happens on both IE and FF. I am told it might have
something to do with Flash. I also don't seem to be able to uninstall my
flash, or reinstall it for that matter. I have perused the site and have come
up with two possibilities....the most likely seems to be something to so with
the Apr. 8 update. That is approx the time the problem started. The other
could be some registration problem, but since I've had flash as long as I've
had the puter - well over a year, that seems unlikely to me. Unless, again, it
might have something to do with an update. Big puter dummy here. Anyone got
any ideas?? Thank you ahead of time!