For Litecoin you can download a fresh blockchain backup from http://blockchain.litecoin.net/litecoin/

make sure you read the readme at http://blockchain.litecoin.net/README.TXT on how to use it. Basically you unpack, then run "litecoind -rescan" to refresh the database.

It's much faster to download from here than to download from the network for most people.

maybe there is one for Bitcoin as well.