Windows 7 - Data encryption

As the tittle says,I'm looking for an encryption method to protect my data against steal or theft.

I'm not familiar within data encryption topic.I'm not sure which is the best data encryption program.

In additional,I dunno where to start find the official web of any data encryption stuffs.

Of course,the official website would says that their data encryption program is the best.

Please share out to me at here the data encryption you were/are using,I would like to test it.

Probably,share the official links of data encryption program,I'm willing to download and test it and get the most benefits data encryption given to me,thanks

Truecrypt is both one of the most effective and the most cost effective (it's free open source). Read the documentation before you do anything else with it. For maximum security, you want the full disk encryption option.

Windows 7 Ultimate edition also has a full disk encryption feature if you're willing to upgrade from Starter.