Is this a triple booting system? Are you unable to run a 64-bit version of Windows 8.1 and Ubuntu?
Any reason to continue using Windows XP?
"Kaspersky Internet Security 2015 / Malwarebytes Anti-Malware Pro / Emsisoft Anti-Malware 9 Full version" are not on-demand scanners, since they are already running in real-time per system. Apart from Malwarebytes, do you use any other scanners?
"COMODO Firewall 8" would be considered real-time protection.
Thanks for sharing.
Edit: (Replied at same time)
You should only use one Antivirus or Suite, else expect conflicts and less security.