How do I del. my trojan horse virus? avast can’t do it. I don wanna get norton or other. I wan free stuff.help

I decided to download a file. I did it. I didn't realize that my SATA(Z:) drive where avast was installed came out. When it vibrated back in, an avast window popped up saying a trojan horse was found. I clicked move to chest. It said it couldn't do it, so I erased the file. Suddenly, a window came up displaying the details of the virus. It says it deletes exe files and hacks passwords. I restarted my PC. It was seriously slow for a 2Gig RAM. I use Acronis to backup my hard disks. So I put back the previous backup file. I hoped the virus was gone. Then I installed avast (That wasn't installed when I backed up my Disk). It says it will do a boot virus scan. In the scan, it found a adwwin(or something like that) virus file. I chose repair. It failed. Then I tried move to chest. It worked! Then another virus. cyborg96. I entered choice 8.Move all virus to chest. After the scan completed, it went into windows. Everything seemed fine. Was this the right thing to do? Pls my dad will Kill me!

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