Hello to everyone

I opened a MultiBit wallet almost one year ago and I put some bitcoins, last week my computer went down and I need to take it to a shop to put all new and eliminate everything.

And now I installed the Multibit wallet but all my bitcoins are missing... ( I have the email from BitStamp to my Multibit adress with the confirmation of the transaction.

Someone who can help me plese? I can pay with bitcoins if you are able to recuperate my bitcoins...

Thanks
riojaoca007@gmail.com