Hello, when i firstly installed avast it asked me to reboot and scan for infected files… in a blue screen, like im installing windows xp… lol … how can i close the pc and scan again for viruses on a screen like this?
Hi Theofilaktos welcome to the forum 
This would be the boot - time scan correct?
A tutorial for that can be found here
http://www.digitalred.com/avast-boot-time.php.
Although, this is normally used if you suspect an infection, do you?
-Scott-
Yep, a sality ***** UP my computer, i removed it with a tool. but there are still problems and want to see what problems, i also scanned with CCleaner, RegCure and ErrorSmart for Errors. and i fixed all problems still nothing. anyway thanks for the link