If you are uploading multiple files, to make things easier for yourself please create a zip file containing the files you wish to be uploaded
Instructions on how to do this are included below:

If you are running Windows XP, there should be a compression utility built in.
Within your file browser, navigate to the folder containing all of your files you wish to upload and right click, by right-clicking it should bring up a menu allowing you to "Send To..." Within the "Send To" dropdown you should be able to highlight something called "Compressed (zipped) Folder"
A window may popup after this step asking if you want to associate "Compressed (zipped) Folder" with your file, click no. After this you will see your files being added to a zip folder, once completed from our file upload page click browse and select this new zip file and click ok. Then finish our upload form and click Submit.

Note to other Operating Systems:

If there is no zip utility on your computer or you are using something other than Windows XP.  There is a zip utility available from http://www.winzip.com - this is only an evaluation version and after 21 days it requires you to license their product.