From RoemerSoftware.com: Optimize and tweak Windows XP with Optimum XP. Optimum XP makes it easy to accelerate, secure and totally customize your Windows XP Home or Pro system with over 150 powerful tweaks and hidden Registry settings. Optimize your CPU, RAM, hard drive, Internet speed, network, security, Windows, Internet Explorer, MS Office and many other applications. Optimum XP uses minimal system resources and is very user friendly.
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