Remove MyStartSearch and more malware, with AdwCleaner
AdwCleaner is a free, portable and efficient utility that will remove adware, PUP/LPI (Potentially Undesirable Program), Toolbars, Browser hijackers.
AdwCleaner works with a Search and Delete mode. It lets you review its findings and choose what to keep or remove.
Since Antivirus and Antimalware applications seem now to take care of all possible infections of a PC, you may not really need AdwCleaner. You can try it, since it is free, and see if it finds any problem ignored by other programs.