2 Copies of windows 7 on bootup

My computer crashed several months ago. I have 2 hard drives so i reinstalled windows 7 on my D drive. I also reverted back to an earlier version of the OS which corrected the problem on the C drive. How can i remove the OS from the D drive now that I don't need it. Whenever I boot up it asked me which OS I want to use. I actually reformatted the D drive but it is still asking me which OS i want to use. How do I correct this problem so it only sees the OS on the C drive. I couldnt find anything in the Bios to correct it. I have a Dell Inspiron 570.

click on the windows version you want at start up

when it loads
click the start (orb)
in the search box type
msconfig
hit the enter button
click on the boot tab
highlight the windows option you dont want
click delete
apply and ok
restart pc, the pc will only boot the option you left

any files will have to be deleted BUT you wont have to select the option

Thank You very much...that fixed it.

your welcome