Ok.. Here's the tip on how to view .CBR and/or .CBZ to your Computer:

-Download .CBR and/or .CBZ file/s and save it to your desktop (basically if you're using firefox the download files are automatically saved to your desktop)
-Change the file extension from .CBR to .RAR or .ZIP (repeat this method same with the .CBZ)
-The icon of unknown file will change to WinRAR/WinZIP icon (after changing the extension name to .RAR or .ZIP)
-Right click on the icon/file and choose Extract to yourfile\
-The new Folder of decompressed file (extracted file) will appear in your desktop. This new folder contains Jpeg files.

-Now you can view the content of .CBR/.CBZ in Windows Picture and Fax Viewer.

Here's the tip on how to view .CBR and/or .CBZ to your PDF Reader:

if you're not satisfied to view these files in Jpeg Mode you can convert JPGs to PDF by simply open your Adobe Acrobat Professional (version 7 and/or above will do).

(in my case, I'm using Adobe Acrobat 8 Professional)

Choose File > Create PDF > From Multiple Files...

A new window will pop on your screen.

Click the Add Files... > select jpgs to combine in pdf file > Click Next > Click Create > Save it to the Destination Folder

and its Done!

Congratz to you! ^_^

Note: Attached file is the keygen for Adobe Acrobat 8 Professional only