I have upgraded from Windows vista to Windows 7 Ultimate on my Acer Aspire 5740 laptop. Also I have upgraded all my drivers. From last few days I am facing problems while playing music. Whenever I try to adjust the volume of speaker using either control from the laptop then my volume mixer crashes. To solve this issue I have also tried to adjust the volume from the icon in the taskbar but it also failed. The volume mixer gives SndVol.exe error and I need a solution so that I can troubleshoot this problem.