WTF is going on? if your computer has been compromised then a quick email isn't really going to solve anything...
I disagree - if your computer's compromised and you withdraw your BTC, you could lose them.
I for one appreciate the warning - gives you the chance to do multiple virus scans, check for key loggers & create a new wallet with a new password before you withdraw.
Indeed! That's why I don't know what OP have on his mind

but he just want to say "BitS...." is bad

and maybe he is right. Maybe not.
This e-mail seems to be very normal... nothing special..