How can I stop Windows saying my software might be harmful?

When my clients download my application, Windows, browsers, Norton et al say my software might be harmful.  How can I stop this?

Thanks in advance.
Clive BeatonAccess DeveloperAsked:
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Clive BeatonAccess DeveloperAuthor Commented:
When my clients download my application, Windows, browsers, Norton et al say my software might be harmful.  How can I stop this?

Thanks in advance.
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
One way is to sign your application with a certificate that is from a trusted root certificate provider or from a self-signed certificate where your certificate is trusted on the client's PCs.
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JohnBusiness Consultant (Owner)Commented:
Have you approached Symantec Support?

There is some software I have to exclude from Symantec (Cain/Abel, Unlocker and a couple of others) but nothing major.
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Brian MurphyIT ArchitectCommented:
So you compiled a Windows binary or installation and every machine shows it has harmful?

On your corporate Network do you have a Enterprise Management Tool for Norton to exclude that binary file?

Does is show up as harmful before or after the installation?

If the user has permissions, they can right click the install or the binary EXE and "Add to Exclusion List" for Norton but on most business networks this is disabled.

Depending on internal Group Policy settings and both Norton it may not accept a "self-signed" certificate.

You would need a Internal CA like Microsoft CA to generate a software signing certificate but depending your Domain version you might not have the option for SHA2 only SHA-1 which is deprecated leaving a third-party vendor certificate like Verisign.

You would need minimum of SHA256 and prefer a private key generated prior to CSR that is RSA256 then 2048 Bit on the SSL Certificate when you submit your CSR.

On the self-signed certificate or Microsoft CA there are Group Policy settings to "allow" or set those as Trusted Root Authorities so they show up properly from the Microsoft CRYPTO API perspective.

MMC Console > Add Remove Snap-in > Certificates > Local Machine (not user) > Trusted Enterprise Root Certificate Authorities and any Intermediates go in the Trusted Intermediate Store.

On the self-signed you could try exporting to PFX from the source where you generated the original CSR and having the private key.  Depending on where you created the private key, CSR then obtained the CER or CRT you could use the DIGICERT Utility to extract the private key and CRT key file to separate files if you have the P7B or PFX file that is the certificate with Private key.
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Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
If you are distributing software "in the wild", you would need to obtain a trusted code signing certificate, as suggested by Mohammed Khawaja and others. Using a self-signed won't work in many cases, and you'll have to distribute the cert and key (and install/validate them) in order for that to work. Plus, if you don't build them exactly right, they'll be flagged as invalid anyway, or may die prematurely, etc etc. All if all, if you're trying to build trust with your potential users you certainly don't want them to be exposed to the nasty underbelly of code signing!

You can buy a cert from one of the Trusted Authorities, such as Symantec, Thwate, Comodo, etc. Those typically aren't cheap, but they're virtually guaranteed to not flag your software. I use the one from Comodo, which runs around $175/yr. You can buy from resellers for less than that, but be careful of the policies and terms of that reseller. Some of them die at the end of the term, which means your software will be flagged as invalid after your subscription expires. Others require that a specific "root" certificate be installed, which can be very confusing for users.
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Clive BeatonAccess DeveloperAuthor Commented:
Thank you, Scott, and all others who have contributed.
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