I currently use Yet Another Cleaner, as for free antivirus, Yet Another Cleaner would be enough to provide good PC protection and clean up.
You can't get better service for free antivirus
Yet Another Cleaner 2014 | Lifetime Free PC Optimizer
All your browsers can not save homepage? Reinstalling may solve your problems.
But if stubborn browser hijacker alters your registry, normally it is hardly to save homepage manually.
Also you can try Yet Another Cleaner,set homepage as the following steps