Your second half is a valid threat (as much as any virus is valid in any case) but the first half is the same email that has been bouncing around since the first breathless AOL'er got wind of a virus and decided to send out alarmist chain mails. Just change the name/yahoo ID/mp3/whatever boondogle people choose to insert in the legend. See also the Blue Star Tattoo chestnut that just wont die no matter how how ridiculous and unfounded it is.
Trust me, when they develop a virus that will (sic) "takes all ur computer details." you won't be hearing about it first in a misspelled email forward. These things are started by people who get a kick out of wasting bandwidth.