I would try a re-install from the link given by jno. However, make sure you un-tick the box marked 'Optional Offer' for the 'McAfee Security Plan' unless you wish to be bombarded with 'take-up' plans for a purchasable Anti Virus programme, when you can get free AV download programmes.
If Jno's link doesn't work (as it may well not do if there's already a defective version of Flash Player on your computer), go to 'Programs and Features' from your Control Panel, look for 'Adobe Flash Player plug-in' and uninstall it. Then restart your computer. Jno's download link should then work.