Thunderstorm Followed By Keyboard

My pc has been working very well. While I was sleeping yesterday there was a thunderstorm. The pc first appeared ok, but upon typing a bad problem became apparent. The Logitech usb keyboard was producing extra characters. I thought the keyboard had been damaged by the storm so I powered down and rebooted with a HP ps2 keyboard in place of the Logitech usb keyboard.The HP keyboard also produces double characters, but the corrupt keys are different keys than the corrupt keys on the Logitech keyboard. [code] I see a pattern here in that the letters all relate exactly to the row below and then the row above.Also, I use the GOM player for video files. The spacebar is PAUSE, but it is also opening up some shortcut in the GOM player.This keyboard - the HP pci wasn't pluuged into anything during the storm. I have gone into Regions and Settings to verify all is standard U.S.. I also went back 3 days and did a System Restore to see if it would help, it didn't.Do you know how I might stop this corrupt double character problem? If I only need a new keyboard, great, but since it is malfunctioning with 2 different keyboards that doesn't seem likely to me.