It seems some parts of siteadvisor are not installing,uninstall siteadvisor for IE.
Then try these steps.
Open Internet Explorer, Go to Tools > Internet Options, Click on the Delete Cookies and Delete Files. Choose to Delete Offline content on the prompt.
while enabling ActiveX manually from Internet Explorer>Tools>Internet Options>Security tab>Custom Level, make sure to set "Download Unsigned ActiveX controls" to "Prompt" & not to "Enable".
Click on the Privacy Tab. Click on the Advanced Button, Select the Checkbox "Override Automatic Cookies Handling" and choose Accept for First and third Party cookies. Also check the box "Allow Session Cookies" Click on the Ok.
Click on the ProgramsTab. Make sure the checkbox "Internet Explorer should check to see whether it is default browser" is checked. Click on the Ok. Click on the Advanced tab, click on the Restore Default button. Click on the Apply and Ok.
Now Go to Start > Run > Type %temp% press enter. Empty the Temp folder by click on Edit>Select all from menu on top & press Delete key from Keyboard.
Open Internet Explorer, Go to View>Tool bars & ensure that only Standard buttons & Address Bar are checked. Uncheck the rest.
Try to install.