I think that my Avast can’t find any virus or trojan or malware…
Can You tell me if it’s right to remove manaually every maleware that I have had in my compyter.
If you think avast! is missing something, try some online scans first:
(Disable avast! while scanning.)
Also try the usual free adware/spyware scanners.
AVG Anti-Spyware Free (Requires Win2k/XP)
Download, install and update the programs. Disconnect from the internet (pull the plug) before running scans in Safe Mode if possible.
Always select the option to quarantine any malware found rather than delete it, then you will be able to restore files or registry entries wrongly identified as malware- a rare but not unknown event for any malware scanner.
If still having problems, post a HijackThis! log.
When you have finished, scan for out-of-date and insecure software using Secunia Software Inspector and update any vulnerable software: this will help to prevent future infections.
Install SpywareBlaster also to prevent future infections: don’t forget to update every month or so.