1. Run a anti-virus scan on your computer just incase there is a program/virus making that happen.
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2. Reinstall TS3 and Arma 3
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3. Open Command Prompt as an Administrator (CMD). Type in the box: sfc /scannow This will verify your system files.
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4. Rollback your Windows to an earlier state -
http://www.howtogeek.com/howto/windows-vista/using-windows-vista-system-restore/ or do a complete wipe of your PC
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5. Make sure you restart your PC with the restart option rather than clicking shut down and starting again. Sometimes just shutting the PC off and starting it up again wont have the same effect as doing an actual restart.
If you still can't fix your PC then at this point Google is your best friend.