I've already read a topic or two about this problem here and I couldn't find if the problem's users are solved or not. So I started again.
I got this message "The AAVM subsystem detected an RPC error" and others from a log such as
aswServ::AavmStart ERROR...
AAVM - initialization error: AavmStart: avworkInitialize failed, 0000A438.
AAVM: VPS load failed, trying to get a fresh copy...
aswChestInterface - Program error description: CChestListView::OnCreate() !m_strErrorWnd.IsEmpty().
aswChestInterface - Program error description: CChestListView::LoadFiles() chestOpenList() failed: 1723.
Error in aswChestC: chestOpenList Error 1723.
Error in aswChestC: chestAddFile Error 1723.
This information located in log event.
I'm deep sure thats impossible to remove some AV such as AVG from a computer, even you have a master programming degree. Its only possible if you have a previous full backup without AVG. I don't know if it's happen with avast. Anyway as I said I got this message and I'm a little stubborn

and decided to solve it.
No way. I had had problems with many windows applications but I never found one that gives me this at this point an unreasonable problem.
I tried all the solutions except "format" my HD.
Repair Avast
Set automatically in services (if not)
Remove Avast from windows AND with Avast remove tool
Lot of boots between this operations
Avast clean install (if it's possible)
Edit register by my own risk and remove ALL references from Avast
Restore register from a previous backup file (before Avast installation)
Some error all the time. So I was thinking what program may cause this conflict? No previous AV installation and the only software with security purposes is comodo firewall (no Comodo AV instalation). I'm really lost and I don't have a hint to solve my problem.
Two question
1) I can use Avast without "resident protection" and how it's affect my security.
2) There's a list of applications are incompatible with Avast?
Thanks in advanced
Just in time - sorry about some errors - English are not my mother tongue.