How to use the Bootrec.exe tool in the Windows Recovery Environment to troubleshoot and repair startup issues in Windows Vista http://support.microsoft.com/kb/927392/en-us 7. Type Bootrec /FixMbr, and then press ENTER8. Type Bootrec /FixBoot, and then press ENTER. 9. Type Bootrec /ScanOs, and then press ENTER. 10.Type Bootrec /RebuildBcd, and then press ENTER. 11.Restart your computer. Now use Startup Repair in Windows RE. To do this, follow these steps: 1. Put the Windows Vista installation disc in the disc drive, and then start the computer. 2. Press a key when you are prompted. 3. Select a language, a time, a currency, a keyboard or an input method, and then click Next. 4. Click Repair your computer. 5. Click the operating system that you want to repair, and then click Next. 6. In the System Recovery Options dialog box, click Startup Repair. 7. After it has performed, click on View diagnostic and repair details to see what was fixed. 8. Restart your computer.