To remove the ask toolbar run the following line in a elevated command line window:
MsiExec.exe /qn /X{86D4B82A-ABED-442A-BE86-96357B70F4FE} /norestart
This will work for versions 1.15.9.0 and 1.15.15.0.
If you want to make a .bat file it can be usefull to kill browsers before you try to uninstall Ask Toolbar.
Here is a single liner to kill IE, Chrome and Firefox in one go. Just add this line befor the MsiExec line in the bat file and you are golden
taskkill /f /im iexplore.exe /im firefox.exe /im chrome.exe
