A free tool to compare 2 files or 2 folders' content in Windows.

http://winmerge.org/downloads/

total commander - free for 1 month

HI jazzIIIlove ,
                    Please check these links. I  hope this the correct answer to your question.

Compare Two Files , Compare whole folders at once.  You choose any two folders, and get a full comparison and analysis of all of the files in both folders.

http://comparetwofiles.com/

guys, must and must be free.

have you tried my above links, these are free.

SyncToy - A Free Microsoft tool...Will compare and synchronize.
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=c26efa36-98e0-4ee9-a7c5-98d0592d8c52

Microsoft has a utility available as part of a Windows NT 4 management package.  You can download it directly from Microsoft: Windiff.exe

http://support.microsoft.com/kb/159214

I guess the other question is what do you need to compare?  Robocopy (also from Microsoft) will do a lot of this as well and export the results to a log file:

http://technet.microsoft.com/en-us/library/cc733145(WS.10).aspx

Sorry, meant to say "Why" do you need to compare?

FileFreeSync = http://sourceforge.net/projects/freefilesync/

Open-Source folder comparison and synchronization tool

Carlito985:
Is it only for folder comparison? What about files?

tapanpattanaik:
Yep, tried, examdiff seems OK, but let's wait for other options too.

did u try winmerge?

I already have given the link...
http://winmerge.org/downloads/

http://www.easyduplicatefinder.com/

files too !! :)