Avast - more update, crashes and alerts

Hello all,

For some time I have any worries on my config:

Avast refuses to upgrade from the 28/11

against it by alerts sent to the following files (among other things, unfortunately I did not note )

c: \ p1y2.cmd

c: \ WINDOWS \ System32 \ CML.exe

c: \ WINDOWS \ System32 \ gctray.exe

but I saw the class as strangers and a bad previous experience made me lose the use of the mouse ... I preferred to ignore pending an update that does not come, even manually ...
I would need your advice and experience to get out of this gallery before planting my system ...

Also my external drive has the air of something rotten trainer but I can not identify even after a scan with Avast (at the time it began to day ...)

Thank you in advance for your help

dismantles your HDD and scan it on another PC

enssuite you go to a seller and you purchased an anti-virus bitdefender or pc-clean

edit ----
I forget to tell you that your avast died because he knows the break with a virus attack

is not an inexpensive solution that?
Buy a new computer to repair another ...
No serious if someone had a solution to keep my configuration and simply correct any that would be great.

I buy another computer
the only thing I said to buy (I understand the word that shocks buy) is an anti-virus

you after your HDD and you scan in another computer that has an anti-virus

Yes, we know sometimes pay, especially for viruses. Throughout the forums to assist in disinfection, we see guys with Avast which spread viruses such as Trojen