FileSystemObject and SubFolders

Hello guys,
I am trying to create an updater in vb6 using CRC32 checksums. I have got the checksum creation code but I don't know how to go into a file directory and get the path of the file. I am using the FSO for this.
This is what I mean:

There is a main folder. (This is the root folder.)
There are subfolders within the main folder.
There might be subfolders within the first subfolders.

I want to go through the all the folders and subfolders from the main folder. How would I go around doing this. I have some code, but it won't work.

Thanks
Abhi2011