Press F5 at boot and pick boot in safe mode with a command prompt. Then run the program bootrec.exe from the prompt. Instructions on that program here http://support.microsoft.com/kb/927392
There is a decent chance you will not be able to boot to the command prompt at all and need a bootable Vista disk.
I found Mrs TZ has several different recovery disks for her Dell laptop with Windows 7.
Will this work on my Toshiba or only on the Dell ?
Sorry.
I read through that and it was mostly mumbo jumbo to me.