Cracking .7z 7zip files?

Hi, i encoded some important doents around a year ago using 7zip, and I have forgotten the pword. I need a program capable of carrying out a brute-force approach on the file to find the pword, or anything that could guess it. I have heard you can do it on Linux, but I am using Windows, and have no access to Linux. Surely there must be a Windows compatible program if Linux can do it? Or is there a way to install Linux on my computer? Either way, I need to access the file, and I ure you I am completely within the law.