My Windows7 can't launch (boot sectore destroyed or dammaged) - How to recover?

My Windows7 can't launch (boot sector destroyed or dammaged) - How to recover?

Hello,

I used to run OS X 10.8.5 and Win7 SP1 (Boot Camp install) on my MacBook Pro (model summer 2010).
I used to run Win7 using Parallels desktop. I have version 9.0.23036 installed.

Unfortunately, the boot sector for Win7 got corrupted or erased (???)
I have many professional apps installed on Win7, not easy to re-install...

I could read a procedure to repair Windows on the Parallels.com support site (http://kb.parallels.com/en/5223)
The problem is that on step 2 (Choose to "Start Windows Installation"), I can't get this choice!
I only get 2 choices: "Download the latest Windows support software" or "Remove Windows 7 or later version".
Does anybody know how I can get the "Start Windows Installation" choice, so that I can launch the Windows DVD through Boot Camp and finally get to WinRE?

Many thanks in advance.