Hi Gene,

>Is there any way to remove the security warning that asked for the valid digital signature?

If you have control over these machines, you can start SECPOL.MSC as an Administrator and modify the settings in Security Settings > Software Restriction Policies. I wouldn't recommend this because you could accidently reducing protection against malicious software.

You won't get a security warning if you use a different browser to download the file.

Since Microsoft stores a flag along with the file information I'd assume that saving it to a FAT32 partition and using the COPY command to move the file to a different location also removes any traces of the download flag. On an NTFS partition using STRTOFILE(FILETOSTR()) to create a new file might achieve the same effect.

Signing the EXE obviously is a possibility.

Downloading the program as a ZIP file and then using a third party tool to unzip the archive should also prevent you from seeing this dialog.