the generic usb webcam driver with windows XP is outdated but your program does not fully support it!
the big problem is that i am stuck with 640x480, but for some reason only the built in windows photographer (choose "usb video device" in "my computer") can take high resolution photographs (1600x1200), and also this guys modified win3.11 program: http://videocapture.sourceforge.net/ but the maximum is 1280*1024 because a higher resolution cannot be selected in the crummy old "capture pin" driver properties page.
your program and media player classic can only access the cam at 640x480 tops, if i go to "usb video device", "capture pin" and choose any higher resolution i get a error message which never appears in the foreground for either mpc or dscaler. the error message does not appear if the video stream is stopped. dscaler is more susceptable to this (or another) problem, dscaler will not run if another program (even if it is currently closed) did use the webcam, it gives me the error "can't create overlay surface: 8876028" and then the program closes which only a reboot fixes.
Bug A
i stop the video playing and the webcam light extinguishes. i go to capture pin and change the res to the max i close it by chooseing OK. i start the webcam video stream, the display stays in 640x480 mode and displays only the top left corner of the resolution i selected. in MPC, i start play and windows says program needs to close - tell microsoft!
Bug B
your program and MPC, if i left video playing, and change the video resolution using the "capture pin" properties, the error that appears behind the windows is titled "error connecting" and the main message is "this format is not currently available" the windows are not closable until i remove this background message.
TIP. one thing i noticed in the program from that guy's sourceforge page is that just after i change the resolution, his program changes size. so i think the problem is your program is not updating to the new resolution set.
MPC is the older type, dscaler is current version.
i overlooked the highest res in that guy's program so its able to go to the camera's max also.