updating sql server database from the user system ?

Question

Hi,

   My application is related to uploading files from user's machine to  the hosting server. These files which are  to be transferred are stored in the byte format in server database.  Here is the overview :

• Client downloads the application from the website
• This software is installed in the form of  windows application (which allows the user to select files to be uploaded ) and windows service ( runs at the user specified time and tranfers the files into the sql server machine) .

Can you suggest any idea how it can be acheived ?