Hello Trudy,
Try to restart the computer, hold the power button for 10 -15 seconds and see if the computer shuts down completely. Once this is done restart the computer and see if you can use the computer efficiently.
If that doesn't help then try disconnecting the external devices and check if the computer works fine.
If you are able to boot to the computer then try to get the event logs to help you better.
Open the link and follow the instructions in to get the event logs so that we can see which application is faulty.
a) Open Control Panel, Go to System and Security, Click
Administrative Tools and select View Event Logs.
b) Select Window****s Logson the left side of the window.
c) You will see a number of sub-categories. Selecting any of these categories will bring up a series of event logs in the center of the screen.
d) Any entries listed as “Error”.
e) Double click any found errors
to investigate.
f) Here you will be presented with any relevant information regarding your errors. Often this will simply display the error codereported by the error. However, other errors or warnings could provide clues to cause of the issue.
(Also applies to Windows 8.1)
http://windows.microsoft.com/en-US/windows7/What-information-appears-in-event-logs-Event-Viewer
Additional Information:
Troubleshoot problems waking computer from sleep mode
http://support.microsoft.com/kb/266283
Note: Modifying BIOS/ complementary metal oxide semiconductor (CMOS) settings incorrectly can cause serious problems that may prevent your computer from booting properly. Microsoft cannot guarantee that any problems resulting from the configuring of BIOS/CMOS settings can be solved. Modifications of the settings are at your own risk.
Hope this helps. Otherwise, feel free to write us back for further assistance and we will be glad to help you ahead.
Thank you