Baidu Browser, Du Speed Booster, and Du Battery Saver recently started installing themselves. I've uninstalled them, I've changed permission settings, I've used anti-virus, I've wiped the SD card, reset the device to factory settings, and changed all of my passwords involved with the apps I use. All three keep coming back. I've also recently noticed Mobogenie, but that doesn't seem to be causing issues, whereas Baidu freezes and tanks the poor tablet. Should I be concerned about these programs, and what can I do to correct the situation and prevent it from happening again? Thank you for your time.

Tablets & eReaders - ZEEPAD - 7 inch Android 2.2 Tablet