| You can use ghost as Nelly has stated, but the drives don't have to be the same size, so you can go big if you wanted to, depending on your system etc.
I'd be tempted to backup your data, burn it to CD whatever.... and do a fresh install of your OS and apps onto the new drive, OK, so it's a pain, and will take time, but you're starting with a blank page and any possible corruption, bloated registry etc will be eliminated. | 
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