ULoader does not support "N" of Windows 7. You can upgrade to US Version of Win 7 and then ULoader will work.
or you can test ODIN by Secr9tos.... it uses a different method...
you also might mention if you have SLIC = none or SLIC 2.0 or SLIC 2.1 now to check an see what SLIC you have
http://fliiby.com/file/852398/yjzywbfd0u.html
Slic dump 3.2 - activate and look under Advanced.

it depends on what SLIC you have on how to properly Activate.
Also exactly what version of Windows 7 are you attempting to "ACTIVATE".
have you used any other activation methods... ?? You are rather vague on exactly what you used or attempted to use.. Did you run ULoader as Admin?