n0z and gordo both made very good points. If you do plan on using cracks/keygens, be sure to scan them with [url=http://www.virustotal.com/]VirusTotal[/url] to check for malware. You might get a few false positives, like Win*2/Generic or Win*2/Suspicious, but you can ignore them. You can also test the cracks/keygens in a virtual machine environment to keep your real computer safe. VMware is a good choice, and they even have a trial so you can test it.