AndrewC: The main problem with cracks, and the principal reason users are directed away from them, is the fact that most of the times they're already infected with a virus/trojan; not that the code of the program represents a security problem (in the end, what most cracks do is provide a reverse engineered file with the DRM routines stripped out, DRM routines which are added after the game is done, so the DRM code and the game-code are mostly independent) but that the sources usually distribute said modified executable already infected.
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Well, if you're running a modern OS (read that as Windows 7 or Vista), have an anti-virus software and haven't messed with UAC then you're pretty much set to be safe.
All software has problems and bugs, but MS has taken security seriously since a couple years ago, so seriously that they delay the launch of a product to deal with important bugs.
1. That's a total load of bullshit......crack authors don't put a damn thing in most(85%+) crack releases. Most times, they release cracked games or exes clean and others rerelease them with viruses either to discredit that crack team or to cause general mayhem(sometimes even people against piracy will do this or similar to discredit crack teams and the cracks they produce or piracy in general and to dissuade people from using cracks).
Most times, if a release is high rated and has lots of positive comments then it's pretty safe to assume it's clean....and a virus scan or two on the user's end before using the exe or game/app will clear any remaining doubt from one's mind right away.
2. Also bullshit......i've had times where my UAC was enabled, windows Vista was fully patched/etc, and my anti virus was running and fully updated and stuff STILL got through. No setup is foolproof.....maybe mostly foolproof but never 100%.(Unless you have a hardware firewall and other protective measures like in a business server environment, or run linux/etc.)