You used blockchain.info.. Right? It does not store wallet locally (except in the cache). The wallet is stored in a db at the server. So I don't see how a disk crash could cause this.
So all you need is the wallet identifier and password. The identifier is used to find which wallet to open.
Did you lose your identifier as well? If so, did you have an email attached with your wallet? If you don't have it, the you need to look at the browser cache to see if the wallet is there. Do not use the computer for anything, and post this in the "Technical support" forum. Someone there will be able to help you.
+1. Am still trying to figure out how disk crash would affect a blockchain.info wallet.
You might loose the client side encryption if you were using browser extension.
But i think you should still be able to access your wallet through web. Isn't it.?
Yup recovery is possible i have recovered accounts from blockchain.info by simply getting the email attachment.
But what i suspect is that he may have used a disposable email address and never bothered to back up the email.
Now that the identifier is lost he cant retrieve any emails from a disposable email address and now it just impossible to get it back