Some people are having problems with 0.5.5 because of some tweaks. The devs have said they are working on it, but for anybody that wants to try, here is how I trouble shot my problems.
What I did was go to search in windows. Type "Java Config".
In the Java control panel click "view". Then delete all the things related to NEM.
Then navigate to the NEM folder and delete the whole thing. C:\Users\user name\nem
Turn off computer and restart. Download the database file.
http://bob.nem.ninja/nis5.h2.db-11772.tgzAlso download the stand alone version from
http://bob.nem.ninja/ (I had to unzip it and then unzip it a second time)
Then start NIS in the stand alone. Then NCC. Then close them both down. (open the folder called "package". click "runNis" and "runNcc". If you do this correctly some command prompt boxes will pop up and be running code)
After 30 seconds close the NIS and NCC.
New NIS and NCC folders were created. Paste in the database into the NIS folder at C:\Users\user name\nem\nis
Do not put any old wallets in NCC. Just make fresh ones when NCC starts.
Restart NCC and NIS on stand alone.
Go to
http://localhost:8989/ncc/web/index.html