Is there a way to transfer wallet.dat into a lightweight client?

[BTCHashers]

So, a while ago my bitcoin wallet got messed up and it wasn't working properly. Anyway, I saved the wallet.dat file and deleted the rest as to reset the blockchain and anything else, hoping that it would solve the problem. So I was wondering if there was any way that I could somehow get my wallet working on multi bit without having to send bitcoins to that adress.

[BTCoinWeb]

here are a few options you could try

blockchain.info wallet import
http://bitcoin.stackexchange.com/questions/5324/how-do-i-import-private-keys-from-bitcoin-qt-to-multibit-client/5328#5328

pywallet
https://bitcointalk.org/index.php?topic=93951.msg1040522#msg1040522

[Gabi]

Not directly.

As BTCoinWeb said you have to export and then import the private key