Safest way to check is as follows:
1. Download the installer to a system(trojan and key-logger free) on which NEM has never been installed before.
2. Install it.
3. Create a wallet and boot a node.
4. Disconnect from the internet.
5. Verify real account information.(Everything seems to be good......COOL!!) If all is not well, Create new real account info. Save the address,public key and private key. Send the new account details to makoto or patmast3r asap.
6. Close program. Go to control panel and uninstall the NEM software and delete all the shortcuts.
7. Go to c:\users\your-pc-name\ and delete the NEM folder.
This way nobody will even know that anything related to NEM ever happened in the pc.
(NOTE: -There is no need to download the whole blockchain to verify real account info.
-If you do not wish to copy paste the real account info, you could always take a screenshot and save the picture for better security. And then you can type in the real account info on launch. At least I have done it this way
)