The (unfortunate) short answer is that there is not much you can do.
As mentioned when you set the secondary password in blockchain.info wallet... there is NO way for support to either reset or remove this password. Also, they cannot tell you what it is:
Second Wallet Password
For additional security, you can choose a second password that is asked whenever you want to spend your funds. Beware that there is no password reset functionality
Additionally, this second password is NOT just for sending funds. It "protects" basically any sensitive data in your wallet. So, you cannot see/do anything in your b.info wallet relating to private keys without the secondary password... this includes exporting keys and/or viewing your 12 word backup phrase.
Your 12 word backup phrase is meant to be your emergency backup in case you lose your wallet-id or password(s). Unfortunately, it would appear that you, instead of writing it down on paper, you chose to back this up on your netbook, which has now suffered a hard disk failure.
Data recovery from failed hard drives is sometimes possible... but can be costly and difficult. A lot depends on how/why the drive failed. If possible you should research data recovery specialists in your city/country and see if they are able to assist. Note that in a lot of instances, unless you are attempting to recover a significant amount of BTC from a wallet, the cost of data recovery can vastly exceed the amount contained in the wallet.
TL;DR - Without either your second password or your 12 word backup phrase, your funds are effectively "locked" in your b.info wallet. You will NOT be able to recover them without one of these two things.