You need to please carry out manual cleaning; uninstallation would pose problems as it wouldn't find a lot of installed files it would expect the system to have.
Then, you should be able to install the application again without any problems.
Here's a link for a complete manual clean-up: http://helpx.adobe.com/photoshop-elements/kb/manually-remove-photoshop-elements-11.html
I hope this helps.
Thankyou for your answer I removed all folders etc following the steps shown but the directions are for Photo Shop Elements 11 I need to uninstall Premiere Elements 8. In the directions I substituted Photoshop Elements 11 with Premiere elements 8 but a lot of the registry files didn't match in my computer. Please note I have successfully ran uninstall for Photo Shop elements 8 it is Premiere elements 8 that I need to uninstall is there a similar directions available for Premiere Elements 8. These are some of the files not on my computer