Simple Image Saving Program

Hey, I've been trying to figure out how to make a program compatible with Windows XP that will open any image and save it as soon as it is opened in a different place.

I would like it to be saved as Wallpaper1.bmp
What really baffles me is how to make it save under different users. For example, if I am signed in as Ricky Bobby the location would be C:\Documents and Settings\Ricky.Bobby2010\Local Settings\Application Data\Microsoft but I were to be logged in as myself it would be C:\Documents and Settings\Tyler.Crompton2010\Local Settings\Application Data\Microsoft
When it saves it should overwrite the Wallpaper1.bmp that already exists which is the current background.

Those are the must haves.
I would be very thankful though if these are added (in order of most desired):
- no prompt when saving
- terminates automatically after saving
- background doesn't actually change unless you right click desktop and click refresh... it would be nice to have it automatically refresh.

And if the following are added you probably love making programs like this:
- combo box to select from screensavers (installed on all win xp comps before shipment) that onchange will change the screensaver.
- same above but for the taskbar colors (such as silver, olive green, and blue)


thank you so much,
- tyler