Had a quick look around and it looks like you need to disable the filter first,but i believe your going to need the password when you very first set this up.
In IE,Tools / Internet Options / Content / and disable Netmop or its filters.
As above it looks difficult to remove.
Have you tried removing this from safemode,tapping f8 on startup.
I have no experience of this software,but also consider stopping it from starting up.
Start / run / and type MSCONFIG and enter / select startup,untick anything related to Netmop and then try to remove this from add and remove programs.
Also check its services,if any.
Start / run / and type SERVICES.MSC and enter,disable any related services to Netmop.