On April 14th Trend Micro reported an "Urgent Call to Action: Uninstall QuickTime for Windows Today". Since then, the US Government has also issue an advisory recommending the same thing, so one thing is clear: It is probably a good idea to remove QuickTime as soon as you can. But why? As Trend reported, there are multiple "zero day" vulnerabilities1,2 that affect the latest versions of QuickTime, and Apple has flagged that it will end support for QuickTime. This means these vulnerabilities are unlikely to be fixed, meaning that if you leave QuickTime on your machine you leave these holes open.
In just over 8 days, Microsoft will officially end support for the venerable, trusty Windows XP platform. This means there will be no more updates to fix bugs, and more importantly, no more updates to fix security issues. This means if a security hole is found after support is ceased, you will remain vulnerable until you move to a new version of Windows!