Did it give you the option to repair ?
If not
Create a Windows 7/Vista System Repair Disc
Note: the below can only be done if your machine has a a type of CD/R or DVD/R optical drive installed. Also depending on the exact type of OEM your machine has you may be unable to actually create a SRD.
[*]Click on Start(Windows 7 Orb) >> Run…(or the Windows key and R together) to bring up the Run box, then copy/paste the following command into the box and click on OK:
recdisc.exe
[*]Allow the[B] UAC(User Account Control)[/B] prompt via selecting [B]Yes[/B].
[*]You should now see a menu like the below:-
http://i280.photobucket.com/albums/kk173/Dakeyras_album2/WTSRD1.gif
[*]Put a blank rewritable CD/DVD in your optical(CD/DVD) drive and then click on Create disc.
[*]Note: If a AutoPlay window pops up, just close it.
[*]When the SRD has been created you will see the below:-
http://i280.photobucket.com/albums/kk173/Dakeyras_album2/WTSRD2.gif
[*]Now click on Close >> OK. Leave the disc in the drive as we will be using it shortly.
[*]You now have a Windows 7 System Repair Disc.
When you reboot you will see this although yours will say windows 7. Click repair my computer
http://i1224.photobucket.com/albums/ee362/Essexboy3/RepairVista_7275.jpg
Select your operating system
http://i1224.photobucket.com/albums/ee362/Essexboy3/RepairVista_7277202.jpg
Select Command prompt
http://i1224.photobucket.com/albums/ee362/Essexboy3/RepairVista_7277.jpg
At the command prompt type the following
Bootrec.exe /FixMbr
[*]Once finished type Exit
Reboot to normal windows and run aswMBRagain please