·What is the exact error message do you get for coprocessor in device manager?
·Did you make any software or hardware changes on the computer prior to this issue?
·Who is the manufacturer of your laptop?
Some computers are designed to use a dual core processor or a coprocessor to improve performance. A coprocessor is an additional chip designed to supplement the central processing unit (CPU) of the computer. Essentially, coprocessors give added speed
and efficiency in the way the computer handles information.
On some occasions, non-standard video drivers loaded onto a computer can cause conflicts with the coprocessor, resulting in an error message. One visual indication of a problem with a corrupted driver, or a conflict between the BIOS and a driver, is the display
of a yellow exclamation point next to a driver in Device Manager window.
For now, I would suggest you to uninstall the display drivers and reinstall the latest Windows Vista compatible drivers for video card from the manufacturer’s website.
1. Type devmgmt.msc, press Ok.
2. In device manager, expand display driver > right click on it> click Uninstall.