debrag

I'm currently trying the AVG turn up app

So I'm having a few problems with the pc: I use firefox but for the last few days I have been unable to start it up and just get the crash message box come up Can't unistall from 'add or remove programmes' and have to use Revo Can't install new programmes on to the pc, missing files/incomplete install etc We use Microsoft Security Essentials, Avira AntiVir, SUPERAntispyware and Malwarebytes. None of these have come up with threats. My partner did a system restore yesterday (unsure how long ago he did it to) but that didn't improve anything. Are there any free health checkers out there? One I've tried come up with 2000+ errors and only fixed 25.