Previously functioning network decides to not work this morning

#1
our step is simple - two windows 7 computers - cable internet and a router....

I set this all up myself months and months ago - this morning nothing was working - called the cable company - reset router and internet -- have gone through ALL troubleshooting for sharing, etc -

Now both computers can see use the internet and the printer -- both computers can "see" each other - when trying to acces the other computer I get the password screen (never needed/used previously) -- type in the login name password -- comp 1 can see comp 2 but can not access any files -- double check comp 2s sharing -- all files enabled for sharing -- use comp 2 to see comp 1 - comp 2 can "see" it but will not open anything - not even ask for password..

I have been at this for three hours -- I am at my wits end and have TONS of work to get done PLEASE HELP!!
 


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