With operating system "
Windows XP Professional SP3 Integrated October 2012 (32-bit) + SATA Drivers" Avast Free 7 has a conflict with a process Svchost.exe, I managed to solve the problem and I think Windows was to blame!
After I tried another Windows, avast! behave normally and protects my computer!!!
It may be that a process Svchost.exe to be suspicious, that I think
P.S-post result after fix
Thanx xD
(Avast 7 Free 7.0.1456)