How To Stop A Download On Steam

Every time I attempt to use Steam source the built in Windows Security attempts to block it and I can't seem to shut this off.
Also every game that I have installed from Steam, such as Arma 2, Killing Floor, Skyrim, etc, is blocked from starting by Windows Security.
Is there a way to simply shut off the built in security? The program has never managed to stop a single actual malicious attempt on my computer but constantly interferes in day to day operations of my computer, to the point of making it impossible to perform the majority of tasks that I want to do, which is gaming.

Steam Pause Download

How can we stop Steam automatically downloading patches? Basically the reason I didn't want to download from Steam because I don't want my game screwed up through stats and all sorts of other things changing through automatically downloaded patches.


It's annoying and sucks.

It has to be asked so don't be insulted, but are you playing on a system being managed by someone else such as a parent or guardian who could've installed some type of parental control software. If your're 'Steamed' at my seemingly patronizing question, it wasn't mean to incite anger, I'm a grownup too and Valve makes some of the best murder/actionware available and I play too much of it. (cut me and I bleed orange Freeman)

If that isn't a possibility, then read further:

Steam

Assuming you aren't just pressing OK or Ignore too quickly, ensure it isn't a Windows Defender or Secrutiy Essentials message warning you about a specific malware. Steam and the rest of the Valve catalog is already whitelisted and shouldn't be accidentally flagged as a false positive since their user community is active and vocal and if a Steam/Valve piece of code was being misflagged as malicious then Microsoft would recieve an overwhleming amount of common complaints along with Valve's and the matter would be resolved in less than 24 hours with a signatures update.

StopStop

How To Stop A Download On Steam

If this is a windows firewall issue and you're still being prompted at gae start despite allowing the port exception, you have an issue with your integrated firewalls ability to retain rules, I perosnally don't rmemver if all Valve/Steam games use that high 5,000 TCP listening port or just HalfLIfe does but whenever I reinstalled or installed an add on or revision of HL, it had to contact Valve on that high 5000 port and it would trigger a FW prompt and I'd just accept it and create an exception. If that is happening to y0ou at evvery instance of launching Steam and your'e pressing accept and accept permanently.... you have a permissions issue either by company policy, GPO or some kind of control ware preventing your Firewall exceptions from being permanantely maintained.