Encryption software for laptop drives that uses a USB key for decryption

I have multiple Windows 7 pro laptops that I have been task with encrypting the whole hard drive on. The hard drive should decrypt on boot up when a USB drive is inserted. These are the requirements.

Since Bitlocker is not available on Windows 7 Pro, Is there a software package that can do all of this. Preferably something open source but not to expensive is ok.
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Hm, I haven't seen any software yet besides Bitlocker that does that. All those I know do combine a USB token with a PIN. And would you want to see people losing both their usb stick and their machine together because they did not stick to the rules to keep those separated?
The almighty list at http://en.wikipedia.org/wiki/Comparison_of_disk_encryption_software gives no hints, either.

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Christopher Jay WolffWiggle My Legs, OwnerCommented:
You may want to consider upgrading to 7 Ultimate to get bitlocker.
EirmanChief Operations ManagerCommented:
The hard drive should decrypt on boot up when a USB drive is inserted
Is that really wise?
There is a huge risk of flash drives being left in laptops, leaving them effectively unencrypted.

I strongly recommend Bestcrypt with a password & USB token. From the website .....
Two-Factor Authentication with conventional removable disks (like USB sticks)
With version 3 of BestCrypt Volume Encryption, encryption keys can be moved to a removable storage.

(See the section on new Ver3 Features)
jimmylew52Author Commented:
Answers were what I expected, thank you all
McAfee has full disk encryption in some of their packages.  You could look at combining this with YubiKey for the USB token to enter the decryption key.  https://www.yubico.com/products/yubikey-hardware.  

Hmm, that may not work pre-boot now that I think about it more.
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