Please try to do the following:
1. download the attachment and decompress it.
2. enter into ensp installed path.
3. find "\simserver\Devices\FW\USG5500\packet.dll" and delete it.
3. open "\simserver\Devices\FW\USG5500\config",
"\simserver\Devices\FW\USG5500\compent1\config",
"\simserver\Devices\FW\USG5500\compent2\config",
then overwrite all those config.xml and datafile.xml by using the files which you decompress them at first step.
4. start ensp as an administrator.