Step 1: go to http://VirrWox.com and sign up
Step 2: Retrieve your password from the email sent from http://VirrWox.com and log into the site.
Step 3: Deposit money through the deposit link on the left. Choose the “PayPal express checkout” deposit.
Step 4: When you arrive at the Paypal page choose the “I don’t have a PayPal account” in order to pay with your credit card.
Step 5: Fill out your information and make the payment
Step 6: After the money shows up in http://VirrWox.com on the top left under USD you can go to the USD/SLL exchange and exchange your dollar to Second Life Lindens (SLL)
Step 7: After buying SLL you can go to the SLL/BTC exchange and change your Lindens to Bitcoins.
Step 8: Withdraw your Bitcoins to your wallet by clicking on the “withdraw” link on the left columns in VirWox.