Terance
I recently read somewhere, possibly in Spyware Hell, that some malware especially cripples CCleaner and other junk removers because some malware hopes to lurk un-detected in junk / temp folders and files, so takes pre-emptive action.
Consequently, if you are suffering with a form of malware, advice in this forum based on how CCleaner SHOULD work may be totally inappropriate to a crippled/corrupted installation.
If I were in your situation I would consider the whole network to be corrupt - all computers and routers and firewalls.
As a perpetual paranoid I would also consider the possibility of virus infection of firmware, bios, cmos,and any other non-disc locations.
I would not trust a hardware firewall - it could already be compromised.
Even if the hardware firewall was NOT compromised, I would only expect it to protect my network from the WWW internet, and fear that it has no ability to prevent cross-infection within my network.
I would fully isolate one computer from all the others, purge as far as possible, and add a good quality software firewall (I recommend Comodo) which gives better protection than a hardware firewall against WWW intrusions, and can be infinitely superior against anything already inside the network.
Only after doing this for all computers would I begin to put them together as a network.
I see danger where ever I look, so going over the top is a bit of a habit, but it might also be why I have been "virus free since 83" !!!
I have expressed my fears and how I would spend my first 5 minutes approaching the situation, BUT I would definitely feel out of my depth.
BEFORE taking any action I would first seek advice and hand-holding from experts, such as in our companion forum Spyware Hell at
http://forum.piriform.com/index.php?showforum=12.
I wish you well
Best regards
Alan