Windows 7 Encryption Software?

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I need to encrypt some folders in windows 7. I was wondering which program is the best (paid or free) in terms of low resource usage and strength of encryption. Bear in mind I only want to encrypt certain folders with a password not the whole drive.

 

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I dont really like truecrypt. I tried something called safehouse, which worked well until I tried to store ISO files in the encrypted container, it kept telling me the container was full when there was over 45GB of free space remaining.

I have windows 7 x64 Professional, so no bitlocker for me