Please help I have that fake FBI virus

I can get into both safe mode with networking and normal. I installed a malware on my computer and it said it took the virus off. Then I made the unfortunate mistake of system restore because it was working funny. So now i can get in but can't stay in and my norton doesn't work so I don't know what my next option is. My daughter uses the computer for school but can't until this is fixed. Any help????