Unplug the scanner/printer then uninstall all it's drivers and apps then head to lexmark.com to see if they have newer drivers or even a removal tool so you can install the driver and apps fresh?
Also, scanners do not need to use Windows Imaging. This is how it was for over a decade and was very unfriendly to consumers. Ouch, 7 isn't much better.
Generic computer with XPSP3
Under Printers and Faxes
KONICA MINOLTA magicolor 1600W
Lexmark 1200 Series
Microsoft XPS Document Writer
Under Scanners and Cameras
Lexmark 1200 Series
Under Administrative Tools/Computer Management/Device Manager/imaging devices/Lexmark 1200 Series/This device is working properly. If you are having problems with this device, click Troubleshoot to start the troubleshooter. (I went through all of the Troubleshooting and the last one asked if the device would work on another computer and I tried it on my laptop and it worked - So I concluded that it is not the hardware or software that came with it but the problem lies with Windows)
After installing the hardware and software, I found that the printer worked but when I click on the Lexmark icon for the all-in-one center the following is what happens:
Preparing Lexmark All-In-One Center for first use. Searching for scanning applications. Please wait. (When this comes on it stays on and nothing happens. It is suppose to find what it needs and then shuts off). It seems to me that there must be a missing dll or some other corruption in windows that is causing this problem. I had contemplated purchasing a scanner, since I don't use the Lexmark for printing (I have the laser printer for that) just for scanning. I do a lot of scanning. But then I thought I might not be able to get a new scanner to work either. Any thoughts as to how I can fix this problem, other than reformatting and installing windows XP again. I have just gone through that 3 times in the last couple of days because of one problem or another. Everything else is working fine.