Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
1) No, using the same switch, router won't give you the same viruses. (Unless they are some new ones that infect the router firmware. Doubtful, but possible I suppose.)
2) Try running Combofix on all your computers.
Areca ARC-1300 is a SAS Non-RAID HBA. Drivers work ok in windows, cause all kind of IO errors in linux when used with MD. FreeBSD has no support as of yet, areca still promising drivers. :(