Lexmark's support site describes a detailed solution for your problem. The general approach is that the Lexmark Vista driver will work in Windows 7 for the X5150 if you follow these steps:
1. Disconnect the USB cable, and uninstall the existing driver using the following method (NOT the Control Panel/Device Manager, Printers/Faxes page, or Add/Remove Programs links):
A. Find the Lexmark 5150 Series on your Start Menu program listing, then go to Tools, then select Uninstall.
B. Click on the Yes button, and then be patient while the process completes.
C. Restart the computer with the USB cable still disconnected.
2. Download the appropriate Vista (32 or 64 bit) driver from this
link at Lexmark.
3. Reconnect the USB cable.
4. Install the downloaded Vista driver normally and restart the computer. According to Lexmark, this will work.
Hope that's helpful.
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