user88316: I am actually a newbie who bought twenty (2) bitcoins in 2010 and I have only just found where I copied down the code or key. How do I get this code or key onto a wallet or USB? Please advise. 

user52021: If you really purchased the Bitcoin in 2010 and wrote down a code you might have own written down an address (a string about 20-27 characters long beginning with a 1). I do not believe any of the above private key formats were available in 2010.
If you did only write down an address, what you'll want to find is a wallet.dat file. 
It's also possible that you might have used a service called instawallet or mybitcoin. If so, your Bitcoins are long since gone.
If you did write down a private key, be careful to not give it to anyone else even if they offer to help. Sometimes people offer to help just to steal people's Bitcoins. Honest helpers will almost never ask for your private keys, since they don't want to be accused of stealing them if you somehow get them stolen.
You can safely describe the first digit or two, its length, and/or how many characters it has in it and that could help us determine if you'll be able to recover and what tools you'll need to use.

88316: <p>I am actually a newbie who bought twenty (2) bitcoins in 2010 and I have only just found where I copied down the code or key. How do I get this code or key onto a wallet or USB? Please advise. </p>
 52021: <p>If you really purchased the Bitcoin in 2010 and wrote down a code you might have own written down an address (a string about 20-27 characters long beginning with a 1). I do not believe any of the above private key formats were available in 2010.</p>

<p>If you did only write down an address, what you'll want to find is a wallet.dat file. </p>

<p>It's also possible that you might have used a service called instawallet or mybitcoin. If so, your Bitcoins are long since gone.</p>

<p>If you did write down a private key, be careful to not give it to anyone else even if they offer to help. Sometimes people offer to help just to steal people's Bitcoins. Honest helpers will almost never ask for your private keys, since they don't want to be accused of stealing them if you somehow get them stolen.</p>

<p>You can safely describe the first digit or two, its length, and/or how many characters it has in it and that could help us determine if you'll be able to recover and what tools you'll need to use.</p>
