I have to encrypt some files (from a linux system) and want to put them on a usb-stick and then be able to decrypt it on a windows system where I don't have admin-privileges and where I don't know which encryption software is installed. 

Is there any way to do this?

* One solution might be that I use something which can be decrypted with standard windows utilities. Maybe this is the case for zip, but I cannot test it because I don't have a windows machine.
* Another option might be to use some portable version of an encryption software. But I don't know if the system allows me to run portable apps.