Deleting any part of an operating system can cause system failure.
Let me say that again: Deleting any part of an operating system can cause system failure.
For those that didn't get it the first two times: Deleting any part of an operating system can cause system failure.
Why is this important? A Computer Hacker will often attack attack a HOST COMPUTER by "fooling" it into "thinking" it has received an UPDATE. Thus part of the code written into the "BAD STUFF" is a mimic of A VITAL BIT OF OPERATING SYSTEM CODE. They (these hackers) do this because they are insidiously cruel. They (these hackers) know you will get tired with updating your software, or running your "restore program" and let them (the hackers) get their own way ~ or keep the BAD STUFF on your computer, where it MIGHT do bad things (and as measured by %age of BUG HOURS this lazy response is a significant figure in keeping the BAD BUG BEHAVIOR "going"...).
Thus, if you "know", absolutely know, what your system, has IS a virus and or etc. etc. AND NOT SOME OTHER EVIL VICIOUS TYPE OF SOFTWARE, then by all means CLICK it away.
But, if you don't know that your software has screened you from deletion of a vital bit of operation system software, that your computer will not run without, and you have failed to simply hit "restore" to a known safe date, making copies as you go of YOUR CHANGES, versus THEIR CHANGES, then simply updating the restored operating system, YOU MIGHT CAUSE YOUR SYSTEM TO CRASH AND NEED A COMPUTER TECH TO GET YOUR DATA BACK.
AND THAT IS SOMETIMES THE ONLY REASON YOU WERE TARGETED ~ AS COMPETITIVE INHIBITION, OR TO SLOW DOWN AND FINANCIALLY HURT A RIVAL.