If I get it from the log, we deleted/uninstalled all the used softwares:

DelFix v10.6 - Logfile created 16/11/2013 at 15:06:46

Updated 11/11/2013 by Xplode

Username : aljiussy - XXXXXX-5089AC

Operating System : Microsoft Windows XP Service Pack 3 (32 bits)

~ Removing disinfection tools …

Deleted : C:_OTL
Deleted : C:\Combofix
Deleted : C:\AdwCleaner
Deleted : C:\ComboFix.txt
Deleted : HKLM\SOFTWARE\OldTimer Tools
Deleted : HKLM\SOFTWARE\AdwCleaner
Deleted : HKLM\SOFTWARE\Swearware

~ Creating registry backup … OK

~ Cleaning system restore …

New restore point created !

########## - EOF - ##########

I installed McShield 2 and reinstalled Malwarebytes, which I had previously uninstalled.
Shall I keep Avast Internet Security, McShield2 and Mawarebytes all working simultaneously? Or will they interfere with each other / slow down my laptop?

Thanks!