Encrypting files on my PC

I would like to encrypt some files on my local Windows PC.
Can anybody tell me a good freeware package that would accomplish this?

My requirements are:
1. I need to encrypt single files
2. I need to be able to extract the information from the file on another PC using only the encryption key (the file would have to be self extracting).
3. Encryption needs to be fairly robust.

I would also like something that is fairly easy to use. Please let me know where I can find such a program and your experience with it.
Thank you
Who is Participating?
BiniekConnect With a Mentor Commented:
You can use freeware AxCrypt

Dave BaldwinFixer of ProblemsCommented:
7-zip and Winzip allow you to encrypt 'zip' files with a password that would be required to un-zip them on another computer.  http://www.7-zip.org/
dannyhopAuthor Commented:
Program added strong encryption and is easy to self unencrypt on another computer without AxCrypt installed.  Just what i was looking for.  Thanks
You are welcome
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