this is a sure sign of a trojan being installed on your system; it's
common for them to prevent task manager from running so it can't be used
to kill them.
run a full scan w/ the usual tools and hope for the best. probably best
done in safe mode. try ad-aware and spy-bot for starters. once the system
is cleaned, be cautious - I'd back up all personal data and prepare to do
a full-up clean reinstall if it seems like the system is still iffy.
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