A few months back all three computers on my wireless network started running very slow - sometimes switching applications takes 60-120 seconds, opening applications may take longer than that. One computer is running Windows 7 and two are running Windows XP (No need to tell me I need to update them - I know that). Since all three of them slowed down at the same time, I suspect some sort or malware but I run a full scan of Comodo Cleaning Essentials weekly which never shows anything and a complete scan of Malwarebytes which usually shows a few malware cookies. I have run sfc /scannow which found and corrected a few problems but no change after that. I have attached a log from Hijackthis. Any suggestions?