Did you actually complete the install successfully? You should have received a message to that effect.
If not, from what site did you download? Which iso image did you download? Did you burn the downloaded image as an image? What software did you use to do this?
I try to install it in a separt drive like I:\ drive
How? Did you boot your computer with the Mint CD in the drive and your CD drive set to first boot priority in the BIOS?
A little more information would help someone to help you.