If you don't have enough computing power, try to use split key generation. There are a few services available, both paid and free, you can use gadman's free service :
https://bitcointalk.org/index.php?topic=270180.0 , he has created one for me for
free.
Here is the guide:
Step 1 : Extract the zip and open bitaddress.
Step 2 : Move your mouse till an address is created after that, Click Vanity Wallet.
Step 3 : Click Generate.
Step 4 : Copy Public Key and save private key in a safe location.
Step 5 : Send the public key part you got and desired name/text(don't forget to add 1 in first).
Step 6 : You will get the private key part after it is generated.
Step 7 : Enter the previously saved private key in 'Your Private Key' column and the private key gadman/other user sent you in 'Pool Private Key' column.
Step 8 : Click 'Calculate Vanity Wallet'.
Your vanity address is generated. If you do this nobody will know your private key and thus, it will be more secure.
P.S. You can also use Samr7's Keyconv tool(
https://github.com/samr7/vanitygen/blob/master/keyconv.c ). Main vanitygen :
https://bitcointalk.org/index.php?topic=25804.0 and compressed private key supporting vanitygen(2x-4x faster) :
https://bitcointalk.org/index.php?topic=301068.0 ~~MZ~~