Antivirus program tells me this file is infected and auto deletes when i try to download it!

The same thing happened when Chronicles of Riddick was released here. I think it had something to do with the DRM removal making the files seem fishy to my (Microsoft Security Essentials) and others' anti-virus software. I just turned it off while it installed but if you are worried try re downloading and manually scanning the installer.

Windows Defender (Well antivirus in general) are notoriously bad at treating DRM bypassing software and anything that injects itself into other executables as malware or virals.

Most of the time you'll even see something like "generic ______32" making it even more obvious that they're just throwing a fit because it looks remotely like something that might, possibly, maybe be bad for you.

Windows defender is not bad at all. I use it all the time and it never once showed me a pop-up or alert regarding anything infectious the program I'm currently running might have. I suggest u to switch to windows defender from whatever else the heck you're using before you get misled onto the wrong path and accept that all antivirus programs are incapable of determining whether a program is safe to run or need to be quarantined of its filth.

I wouldn't be surprised if you'd use Avast as it is notorious for false-positives (detecting viruses where there aren't any).
If you want to be sure do as follows:
- Deactivate your anti-virus or configure it not to delete suspected files but put them into quarantine
- Install the game, but don't start it to be safe from any potential virus
- Get the suspicious file from the game's folder (or quarantine location) and upload it to www.virustotal.com and let it check
VirusTotal checks files with a bunch of different virus scanners, so you can see what other engines think of it.

A lot of false alarms are based on rather exotic compression programs. Software executables are usually compressed (like zip files). When this compression algorithm isn't one of the standard ones, anti-virus softwares sometimes throw an alarm, as viruses and Trojans are often compressed with non-standard compression algorithms as well. That's a bit overcautious in my opinion, but hey, every alarm gives the user the feeling that the anti-virus software is doing a great job. Do you get where I'm going to ;-)

That's a good one. :-)

Windows Defender (AKA Microsoft Security Essentials) is so notoriously bad that even Microsoft recommends against using it!

Link 1, Link 2

ye, but that article is from last year though, so many patches have been implemented and so much has changed since then that it becomes a rather moot point. My drift is that Windows defender is built-in to the operating system so the average user don't need to tinker with it as they are already passively protected in such a manner that they wouldn't need to feel the need to install a third-party anti-virus software unless they continually access porn sites and the such. In other words, defender is quite adequate for the "vast majority" of consumers in the world who runs an up-to-date windows operating system and Microsoft will continue to provide the necessary patches and support for their product(s) in the long-term so it really isn't a problem if u don't get extra third-party protection. Plus, defender is more intuitive to use and simple to navigate its interface that makes it very user-friendly. And it does not come with ads or extra add-ons that u might find with the installation of a third-party product.

Delete your antivirus and get a better one.

I get that you like MS Security Essentials and it seems to suit your personal needs. But the fact remains, that it is one of the worst solutions you can go for. Here's a test from this April to support that argument.
While usability is indeed fine, it fails in the most important part: actual protection. So please do not mislead other people into thinking that it's an adequate solution.

Still can't beat the price of free though, essentially u get what u pay for essentially, not everybody want to or can afford to shell out up to $79.99 or greater moolas every year to get the best protection available and that the free version of such paid suites are always gimped in features and annoy u with third-party ads and offers when u use it.

What is the name of your virus ? Because sometimes antiviruses gives false warning for code packs.