Indeed. In fact, if you go to google.com and ask it to
search for jdbgmgr.exe, the very first match is a pointer
to the symantec article on the hoax. This particular hoax
isn't new; it's a bit over a year old.
Such hoaxes are very common. You should *always* check for
hoaxes before forwarding any such general warning. Usually
all you need to do is go to any of the search sites and
type in a few keywords from the warning message. Unless
it's a very new hoax, it will be covered by all the
security sites, and the search sites will take you right to
In this case, you may have disabled some parts of java on
your machine if you follow the instructions. This may or
may not affect you, depending on whether any of the
programs you use happen to be written in java, and whether
they use this module. It's used mainly during debugging, so
it may not affect you unless you're a java developer.