You can download the uninstaller from Macromedia :
Once you have uninstalled you will have to review your security settings for IE.
Open a browser window and go to Tools/Internet Options/Security
Next make sure the security level is set to Internet [The Globe] and further down you will see a button "Custom Level"
Click this and in the window that opens scroll down to :
ActiveX Controls and Plug-ins :
Download signed ActiveX Controls - click "Enable"
Download unsigned ActiveX Controls - click "Disable"
Initialise ActiveX Controls Not Marked As Safe - click - "Disable"
Run ActiveX controls and plug-ins - click "Enable"
Next - below the window you will see a dropdown menu which should be set to "Medium"
Next press the Reset button and you will be asked if you want to change the security settings - click "Yes".
Download a fresh copy of Flash from click here by clicking the "Install Now" button
You should be OK now.