Win7 home version of the keyboard failure phenomenon solution in the

machine room, the student machine installed win7 home version, the keyboard failure phenomenon, the solution is as follows: Because the keyboard is invalid, so only use the system's own soft keyboard to operate, win7 soft keyboard It can be found in the attachment---easy access---screen keyboard. In the run, type: regedit, open the registry and locate it to HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlClass{4D36E96B-E325-11CE-BFC1-08002BE10318}, delete the UpperFilters item, uninstall the keyboard device in the device manager, and restart. In the run, type: regedit, open the registry and locate it to HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlClass{4D36E96B-E325-11CE-BFC1-08002BE10318} to add the string UpperFilters, the content is kbdclass. Uninstall the keyboard device and reboot. The keyboard returns to normal after rebooting.