Hi,
Thank you for posting your query on Microsoft Community.
From your issue description I understand that Intel(R) 82801GB/GR (ICH7 Family) LPC Interface Controller - 27B8 is not working properly.
To resolve this issue I want you try the following methods.
Method 1: I want you to install the driver from the link given below and check.
http://intel-r-82801gb-gr-ich7-family-lpc-inter.drivers.informer.com/
Method 2: I want you to follow the links and instructions mentioned in the links.
http://windows.microsoft.com/en-us/windows7/open-the-hardware-and-devices-troubleshooter
http://windows.microsoft.com/en-in/windows7/update-a-driver-for-hardware-that-isnt-working-properly
http://windows.microsoft.com/en-us/windows7/what-to-do-when-a-device-isnt-installed-properly
I also suggest you to follow the steps from this link as suggested by messy head and james norman UK.
Hope the information helps.
Do get back to us and let us know the status of the issue by your next post or in case you need further assistance regarding Windows.