Routerlogin.net not working

> [...] after connecting everything, [...]

   Not a very detailed description of the equipment, or what's connected
to what.  ISP?  Modem? ...?

> [...] my PC (wired) can't acces "http://www.routerlogin.net/"

   What happens when it tries?  

   "can't" is not a useful problem description.  It does not say what
you did.  It does not say what happened when you did it.  As usual,
showing actual actions with their actual results (error messages, LED
indicators, ...) can be more helpful than vague descriptions or
interpretations.

> After using CMD i noticed that there is no Default Gateway.

   I'll guess that that was in the report from an "ipconfig" command.
(See above.)  What's in the rest of that report?  Copy+paste is your
friend.

> I also tried using the hardware reset button but it doesn't work.

   "doesn't work" is about as helpful as "can't".  (See above.)

   Visit http://netgear.com/support , put in your model number, and look
for Documentation.  Get the User Manual.  Read.  If mysteries remain,
then asking questions which contain some useful information might get
you further.