Perhaps you made the classic mistake of pressing any key?
Follow this guide (with screenshots) of a W7 reinstall (reinstall as in format a previous used HDD) click here
Now "Press any key" boot menu. Do not do this as it will only start the reinstall from the beginning again. Wait the 10 seconds that it appears on screen and resist the temptation...
You will need a product key for your install of W7.
If not got one then perhaps you could reinstall Vista and use the product key on the base of laptop.
Have you wiped the back to factory recovery partition?
Could do with a few more details of laptop, and what you have done at it, so that alternatives can be advised.