cannot open any exe file in windows 7

my son somehow dl'ed an update for flashplayer and now all icons exe files have the 'f' icons , everytimes i try to run anything , it gives my an option to 'open with', folder... i have seen so many solutions but they all want me to use regedit etc and they are all exe files . used a flashdrive and got antimalware software to run from there and they all turned into 'f' icons and will not run except to offer me the 'open with' folder

what can i do please ?
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More about open exe file windows
  1. sounds like a virus to me... download and install windows security essentials - or another antivirus and run a scan to clean.
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