If your window started popping up when your computer first loads, a black rectangular window labeled taskeng.exe, but there is nothing in it. Almost immediately after a prompt comes up that says...
"Windows cannot find 'C:\Program Files (x86)\Search Extensions\Client.exe'. Make sure you typed the name correctly, and then try again."
Resolution
1. Start > Type: Task Scheduler
2. Click on "Task Scheduler (local)" in the left pane, then click on 'Active Tasks'.
Double Click on "RocketTab Update Task"
If you cannot find "RocketTab" under 'Active Tasks', Look for "C:\Program Files (x86)\Search Extensions in the "Location" field.
3. Select the entries showing "RocketTab", click "Delete".
4.Reboot PC. The popup box and error message should disappear.