volume decreases automatically on lenovo z500, windows 8

[parag10101]

hi
i am using lenovo z500 ,windows 8.
i just recover my laptop to its initial point .after recovery suddenly the volume goes down automatically again and again .
whenever i press the volume up button .volume goes down ,
and volume bar popup again and again .
i already have made changes like :
do nothing in communications
disable all sound effects in enhancements .
so plzz help me with this

 

[jr9]

Have you tried reinstalling your audio drivers?

https://pcsupport.lenovo.com/ca/en/products/laptops-and-netbooks/ideapad-z-series-laptops/ideapad-z500-notebook/downloads/ds037393