Click Start -> Control Panel -> Administrative Tools -> Computer Management -> Disk management and see if the drive shows up there. If it does, you may just need to assign a drive letter. If it doesn't, reboot and go to the BIOS setup and see if it shows there. If it doesn't, the drive isn't properly installed. If that's the case, I'd remove the drive, get myself a $30 enclosure, put the drive into that and plug it into a USB port where it should work if the drive is intact.
I installed an old hard drive and it is not recognizing it....what do i do...please help....this old hard drive has info on it in regards to an estate for my sister in law that passed away and my wife needs to settle it...also email from it on outlook express //......please help !!