why exe files are not running on my win7 toshiba laptops.i have avast/malwarebytes/malware hunter pro.if i have virus then why my security softs didnt help me.
Because anti-virus programs and anti-malware programs are not that good, as I keep telling everybody. But it could also be that your hard drive is breaking down or Windows isn't working properly. Hopefully you have backed up everything because it might come to a re-install of Windows. First though try a restore to an earlier time if you can.
But do any exe files work? Can you open a web browser? If no exe files open then its a file association issue, if only some don't open then its something else.
In my opinion, you should back up your data and reinstall windows fresh. Seems you have some major corruption somewhere. Have you tried running sfc /scannow to check for file corruption?