Avast won't work after virus removal

I am repairing my grand daughters computer. It had a virus called “FakeAV” on it and after I removed it I cannot get Avast to work. I uninstalled it and reinstalled it but it still won’t come up when I double click on it.

Any help on this? TIA grandpagary

how did you remove the FakeAV ?

follow this guide and attach (not copy and paste) logs from…Malwarebytes / OTL / aswMBR
http://forum.avast.com/index.php?topic=53253.0

I took the HDD out and installed it in another computer and used Avast and Malwarebytes on that computer to clean the HDD. It took 36 hours.

well…follow the guide i posted, then essexboy can see what you did not remove…and if anything is damaged