ctrl c does unwanted screen capture rather than copy

[Dave D]

In any office document, if I paint a field, and press
ctrl + c, I then move to the destination, and press ctrl
+ v to paste it, and instead of pasting the data, it
pastes an entire screen shot of what ever is on my desk
top. If i right click and do copy and then paste, it
will usually work properly the first time, but then if i
continue to ctrl-v it will eventually revert back to
pasting a screen capture. Any suggestions?

Thanks