{HARD DISK} boot up problem, Please help.

Hi guys
please help me , im noob
and not so good in english so please just help me
i got some big problem here
well i got a desktop acer asphire vista
and somethings wrong with my boot up
everytime i turn on my computer
it have that black screen and white cursor in top left corner
i dont know whats this is, so what i did
was chek the bios setup and chek if my hard disk is detected and so i did chekd it and it was detected and then i runed the system recovery it says i dont have operating system
or hard disk
i dont know why is like this
it happen because
i downloaded this prgoram call "FAT 32 FORMATER"
and i did pressed something called "INITIALIZEE DRIVE"
and i press that and it runs with blue screen and i panic and tot it was virus
so what i did is , i forcely turnd off my computer and after that when i turn it back on
it have that black screen with white cursor, and cant even run safe boot or anything
only BIOS SETUP AND ya .
please help me asap
i dont know what else to do
i dont wanna open the computer
cause it myt void the warranty
and i dont wanna loose my data and everything
on my hard disk. so please help me

BTW I GOT SATA HARD DRIVE
AND ON BIOS SETUP
MY IDE IS NOT DETECTED
BUT MY SATA PRIMARY MASTER AND SLAVE IS DETECTED.

thanks ~

reinstall vista, pretty simple