You need to completely un-install QuickTime. Completely un-installation mean that you have to remove other associated files with this and remove it from registry also. I would recommend to use a system cleaner tool like Reginout to fix registry errors and remove all unwanted files after un-installation of Quicktime. Hope problem is fixed.

Use a good uninstaller tool if windows Add or Remove Program is not working fine. After un-installation use system utility tool like Reginout to fix corrupt registry and junk files of the uninstalled program, because corrupt registry files are not removed during  un-installation.

I would prefer Windows 7 Ultimate, it gives you everything Home Premium and Professional offers - plus added security features and the flexibility to work in multiple languages. Help protect your data on your PC and portable storage devices against loss or theft with BitLocker. Work in the language of your choice or switch between … Read more

You can delete Cookies manually by Options/ properties in browser.. It slows down your browser. I would recommend to use pc cleanup utility tool like Reginout to optimize pc and remove unwanted files from your PC.

Perform the following steps:: > Run AntiSpyware > Scan PC with an AntiVirus > Fix Registry Errors with Intel software Partner Reginout > Also use a software to disable Autoruns

- Update browser - Update Flash Player and Java runtime environment - Clear cache and remove temporary internet files - Use Reginout to remove junk files from your PC and Browsers.