man, to get proofs u dont need to press f10. and its useless
to record a demo u must open console, with º key (the left from the 1 key, over Q, W, E... keys)
once u opened console u must type: record "cheater´snick" and press Enter key
in this case, u should type: record kgbplayer, and press enter
a demo will be recorded and saved in ur CS folder, in ur Pc
for stop recording, just type stop in console
search for this demo in ur CS folder, looking for the nick u entered in console (in this case, kgbplayer)
upload that file .dem in website, for example mediafire or sharedfiles, and post herer the link so we can download ur demo and watch it
a good and long demo is the proof we need for ban, not a screenshot