Right-click 'Computer' > 'Properties' > 'Advanced System Settings' > 'Performance Settings' > Choose "Adjust for best performance."
This is the most significant risk. Hackers often take a small file (malware, a trojan, or a keylogger), name it Windows7_Ultimate_Highly_Compressed.iso , and upload it to file-sharing sites. Once a user downloads and runs the file (or tries to "extract" it), the malware infects the system. windows 7 iso highly compressed