Devo purtroppo tornare a chiedere aiuto. Il PC ha di nuovo problemi, simili a quelli che avevo. Alcuni siti sono bloccati, i programmi non si aggiornano tutti, la connessione è lenta, i download pure e a volte il consumo della CPU schizza in alto.
Avira mi ha individuato alcuni file infetti (che ho naturalmente cancellato) dal worm kido, ma la situazione non è cambiata. Consigli?

Qursto il report di avira:
Begin scan in 'C:\'
C:\pagefile.sys
[WARNING] The file could not be opened!
C:\Documents and Settings\NetworkService\Impostazioni locali\Temporary Internet Files\Content.IE5\81W4N7KF\abtelq[1].gif
[DETECTION] Contains recognition pattern of the WORM/Kido.BT worm
[NOTE] A backup was created as '49e4b1d6.qua' ( QUARANTINE )
[NOTE] The file was deleted!
C:\Documents and Settings\NetworkService\Impostazioni locali\Temporary Internet Files\Content.IE5\81W4N7KF\jktk[1].gif
[DETECTION] Contains recognition pattern of the WORM/Kido.BG worm
[NOTE] A backup was created as '49e4b27b.qua' ( QUARANTINE )
[NOTE] The file was deleted!
C:\Documents and Settings\NetworkService\Impostazioni locali\Temporary Internet Files\Content.IE5\81W4N7KF\ysnfdtd[1].gif
[DETECTION] Contains recognition pattern of the WORM/Kido.IH.132 worm
[NOTE] A backup was created as '49deb287.qua' ( QUARANTINE )
[NOTE] The file was deleted!
C:\Documents and Settings\NetworkService\Impostazioni locali\Temporary Internet Files\Content.IE5\9Y9PVP3D\uoymgjyf[1].gif
[DETECTION] Contains recognition pattern of the WORM/Kido.EZ worm
[NOTE] A backup was created as '49e9b287.qua' ( QUARANTINE )
[NOTE] The file was deleted!
C:\Documents and Settings\NetworkService\Impostazioni locali\Temporary Internet Files\Content.IE5\ZP0S8P41\eyqdzqw[1].bmp
[DETECTION] Contains recognition pattern of the WORM/Kido.BW worm
[NOTE] A backup was created as '49e1b296.qua' ( QUARANTINE )
[NOTE] The file was deleted!
C:\Documents and Settings\NetworkService\Impostazioni locali\Temporary Internet Files\Content.IE5\ZV0YX9B5\fvxg[1].gif
[DETECTION] Contains recognition pattern of the WORM/Kido.BG worm
[NOTE] A backup was created as '49e8b298.qua' ( QUARANTINE )
[NOTE] The file was deleted!
C:\WINDOWS\system32\urtqim.dll
[WARNING] The file could not be opened!
C:\WINDOWS\system32\drivers\dtscsi.sys
[WARNING] The file could not be opened!
C:\WINDOWS\system32\drivers\sptd.sys
[WARNING] The file could not be opened!

Scansione di systemscan: http://freefilehosting.net/download/4441c