It would appear that Canon Powershot cameras, at least out of the box, do not support Win2k3 (but see this post).
After installing the drivers and applications for my Canon camera under Windows 2003 Server, I get the following error on each bootup:
The Canon Camera Access Library 8 service depends on the following nonexistent service: SSDPSRV
Using regedit I searched for SSDPSRV, and removed this dependency (see thread that suggested this) so that the Camera Access Library would load, but apparently it really does depend on SSDPSRV. Turning on the camera does load the Windows Image Acquisition manager (after I enabled that service using the services.msc tool), but does not load the Canon tool for downloading images. Nor does it seem possible to manually load the Canon tool by running the CameraWindow application when the camera is plugged in. I tried various "run in compatibility mode" settings, and none of these helped, either.
I also tried installing the TWAIN driver that is used under Win2k to download pictures from the camera, but on the next boot I got this error message:
szAppName : CameraWindowCompDVC6.exe szAppVer : 220.127.116.11
szModName : CameraWindowCompDVC6.exe szModVer : 18.104.22.168
offset : 00006ee3
I tried the Get Canon! program, and altho it could detect the camera's presence after I turned on WIA, it cannot "connect to camera". The program's author confirmed that GetCanon supports neither Win2k3, nor Vista.
I also contacted Canon. After some run-around they told me that Windows 2003 is not a supported platform, though, when I asked, they told me I could not post their official reply to this blog. I guess they don't want to own up to the lack of support, since their website doesn't say anything about it either. They also said that they have no plans to support Win2k3. Their suggestion was to use a card reader! Clearly, they are clueless about what's going on, as WIA does work under Win2k3, so you can always download the photos using MS's feature-minimal photo download wizard. Pretty disappointing, Canon.
No thanks to Canon tech support, there is a workaround that allows the Camera Window program to aquire images from your Canon camera.