The version of QuickTime installed on the remote Windows host is older than 7.4.5. Such versions contain several vulnerabilities :
Binary data 4458.prm
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1013
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1014
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1015
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1016
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1017
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1018
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1019
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1020
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1021
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1022
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1023
lists.apple.com/archives/security-announce/2008/Apr//msg00000.html
support.apple.com/kb/HT1241