The following was copied/pasted from https://www.us-cert.gov/ncas/alerts/TA16-105A
According to Trend Micro, Apple will no longer be providing security updates for QuickTime for Windows, leaving this software vulnerable to exploitation.
[In particular] The Zero Day Initiative has issued advisories for two vulnerabilities found in QuickTime for Windows.
Computers running QuickTime for Windows will continue to work after support ends. However, using unsupported software may increase the risks from viruses and other security threats. Potential negative consequences include loss of confidentiality, integrity, or availability of data, as well as damage to system resources or business assets. The only mitigation available is to uninstall QuickTime for Windows.
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The following was copied/pasted from http://blog.trendmicro.com/urgent-call-action-uninstall-quicktime-windows-today/
(E)veryone should follow Apple’s guidance and uninstall QuickTime for Windows as soon as possible.
This is for two reasons.
First, Apple is deprecating QuickTime for Microsoft Windows. They will no longer be issuing security updates for the product on the Windows Platform and recommend users uninstall it. Note that this does not apply to QuickTime on Mac OSX.
Second, our Zero Day Initiative has just released two advisories ZDI-16-241 and ZDI-16-242 detailing two new, critical vulnerabilities affecting QuickTime for Windows. These advisories are being released in accordance with the Zero Day Initiative’s Disclosure Policy for when a vendor does not issue a security patch for a disclosed vulnerability. And because Apple is no longer providing security updates for QuickTime on Windows, these vulnerabilities are never going to be patched.