None of their software is essential to get back a FIOS internet connection. You should be able to just reconnect.
Most of the rest including other software is off of page http://www22.verizon.com/residentialhelp/fiosinternet
If you are not using their Webmail, but an email client see the instructions at https://www22.verizon.com/ForYourHome/VZRepair/vziha/Service.aspx?ihaweb=EmailSetup
Probably you weren'tt using Verizon Internet Security Suite but considering getting such a suite. Look at such suites from others (MacAfee, Symantec, etc) or get VISS http://www22.verizon.com/ResidentialHelp/FiOSInternet/General+Support/Security/QuestionsOne/85302.ht...
I dislike Verizon's In Home agent. But if you want it its available at http://www22.verizon.com/residentialhelp/inhomeagent?CMP=EMC-CONS09008