My Computer did an automatic update and deleted all my live essentials including 4 years of non hotmail emails

I am downright livid. My computer did an automatic update and I just went to check my email and the windows live program is gone. And so is all my emails I had saves with attachments and documents for four years. It is not in my windows.old. They are nowhere to be found. I am absolutely livid. I cannot understand what happened and I do not know how to go about fixing it. There was a large amount of files in my recycle bin which ended in .tmp and I thought they were .tmp files associated with the upgrade I DID NOT ASK FOR but my computer decided to implement.  I emptied the recycle bin yesterday only to discover today I am now hooped. WTH just happened?