Strange kind of problem

[Torquay-Pete]

Hi guys, I hit a strange problem the other day when I was editing some photos to upload to flickr.I went to save a file and the save box filled with the letter j..something like this jjjjjjjjjjjjjjjjjjjjjjjjjjjj. this could not be stopped or deleted.
I stopped the program using task manager. From then on any box which needed text entering completely filled up with the same pattern of jjjjjjjj? This rendered th PC almost unusable, couldnt log in to anywhere, couldnt search for anything etc. Tried System restore but this wouldnt restore to anywhere. Check-disk came back with nothing. Thinking that this was a busted keyboard I bought a new wireless mouse and Keyboard set...same results again. I have reinstalled windows as this was all I could think of to repair this error. This worked fine for an hour or two then the problem returned...getting a bit hacked off by now as you can imagine .........any ideas anyone please????
thanks in advance as always Pete

My specs are Custom built PC Running windows 7 ultimate 64 bit with Bulldozer 6 core processor, 16 GIG ram 2 500GB hard drives radeon 6500 series graphics card

[Gecko]

[Torquay-Pete]

Thanks for the help...I managed to do another check-disk and this seems to have sorted it...I hope