Well it sounds like the wrong driver was installed for your camera. Normally drivers don't tend to take effect until a restart. When you first boot up the PC try accessing safe mode (keep F8 pressed in, but this needs to be done when the BIOS info is showing) and select safe mode. This should boot a limited windows and via this you should be able to uninstall the camera by accessing control panel, then add/remove programs, then looking for the logitech camera entry in the list. If you can't find any relevant entry you can access device manager via control panel- system- hardware- device manager and uninstall the camera from there.
Regarding the laptop sometimes what you describe could be a problem with the integrated graphics chip. If you can remember when the problem started that might help. Driver issues can be a problem here too, and depending on how old your laptop is it might have broken down.
Hope that helps.
Edited by NUMBER, 11 March 2009 - 07:19 PM.