Did you just run into a download or a file on your computer that has a digital signature from NovaShield Inc.? If so, please read on.
You'll probably see NovaShield Inc. when running the file. The publisher name shows up as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view the digital signature details for NovaShield Inc. with the following procedure:
Here's a screencap of a file that has been signed by NovaShield Inc.:

As you can see in the screengrab above, Windows reports that "This digital signature is OK". This means that the file has been published by NovaShield Inc. and that the file has not been tampered with.
If you click the View Certificate button shown in the screenshot above, you can see all the details of the certificate, such as when it was issued, who issued the certificate, how long it is valid, etc. You can also see the address for NovaShield Inc., such as the street name, city and country.
VeriSign Class 3 Code Signing 2009-2 CA has issued the NovaShield Inc. certificates. You can also examine the details of the issuer by clicking the View Certificate button shown in the screenshot above.
The following are the NovaShield Inc. files I have collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/47 | nskernel.sys |
| 0/43 | nsnetmon.sys |
| 0/47 | nsnetmon.sys |
| 0/41 | nsnetmon.sys |
| 0/48 | nsnetmon.sys |
| 0/47 | nskernel.sys |
| 0/43 | nsnetmon.sys |
| 0/41 | nsnetmon.sys |
| 0/46 | nskernel.sys |
The detection percentage is based on that I've collected 403 scan results for the NovaShield Inc. files. 0 of these scan results came up with some sort of detection. If you like, you can review the full details of the scan reports by examining the files listed above.
The analysis has been done on certificates with the following serial numbers: