If you have been seeing a choose boot location screen then follow the directions below.
You need a installation disc for the Windows OS on your computer. A Windows upgrade or system recovery disc will also work. You do need to match the OS service pack and level with that on your computer. (So it you have Windows XP 32-bit with Service Pack 3, you would need the Windows XP SP3 installation disc. If the computer has Vista Home Premium 64-bit with SP 1, you need that installation disc.)
If you do not have the Windows disc, you need to get one. Try a local Windows User's Group or your local computer service company.
Next you need to boot to the Windows disc. First you need to put the installation disc in the optical drive. If the laptop has a CD tray, you may be able to eject the tray with the computer off. Place an unfolded paper clip into the emergency eject hole below the tray and push. Then pull the tray all the way out, remove any disc in the tray and put the CD in the tray and push the tray closed. If you have a slot loading CD, if you know there is no disc in the optical drive, power on the computer and then slide the installation disc into the slot. Power off the computer once the disc is seated. Now turn on the computer while pressing F12 or C (there should be a brief screen that shows the correct key) repeatedly (quick presses) and select Boot from optical disc. You may need to try this several times (turn off the computer then retry). I frequently miss the key stroke for changing the boot order.
When the computer boots to the CD, select your language and the other prompted messages. Next choose Repair your computer and then select the OS to repair. In the Sytem Recovery Options, choose Startup Repair. Restart the computer.
If the recovery console doesn't repair the boot manager automatically, you may need to rebuild the files with Bootrec.exe. Repeat the above steps but in the System Recovery Options choose the command prompt. Then type Bootrec /RebuildBcd and press Enter.
If it finds the file type Yes to include it. Otherwise, you will need to recreate the file. Type the following lines in order; press ENTER after each command:
Bcdedit /export C:\BCD_Backup
ren c:\boot\bcd bcd.old
Restart the computer.
If the above doesn't work, then you need to repeat the boot to CD steps and then rebuild the boot files with bcdedit. I'll give you the link to the Windows support page: http://support.microsoft.com/kb/927391
(this is for Vista but the recovery from the optical disc is the same under most of the versions of Windows). You can search at microsoft.com for the recover procedure for your specific OS.
These directions will work if the hard drive is still good.
I hope this helps.