There are a lot of products out there that will work with most Windows OSs. Sophos, Check Point...you can also buy encrypted hard disks and not worry about the software part of it. There are probably a lot of suggestion on Tech Republic or you can find reviews all over the place. A good place to go for security software reviews is SC Magazine. Here's a review they did on Check Point Encryption last year. http://www.scmagazine.com/check-point-full-disk-encryption-ve8020/review/3567/