Download and install
CCleaner. While there, take the "Tour", and read through the FAQ. When it has installed and you have read through the important stuff on the webpage, open the program if its not already open, click "Check for updates now ..." down at the bottom right-hand side of the page. When it has completed its update process (it may or may not find updates), close the program, then close all browser windows, disconnect from the internet, re-launch CCleaner, and select "Tools" (the orange-ish gear icon in the left panel).
Select the "Startup" tab, and look in the right hand panel for entries recognizeable as the application giving you trouble. Highlight it, then click the "Delete Entry" button down at the bottom left of the page.
Now, select the "Uninstall" tab, and look in the righthand panel for the app that you want rid of. Highlight it, then click the "Run Uninstaller" button at the top righthand side of the page, and confirm .
When that has completed, select "Issues" (the blue stacked blocks icon), and make sure everything in the "Issue Scanning Settings" is selected, then click the "Scan for Issues" button. This could take a while. When it completes, check through the list in the righthand panel to make sure there's nothing there you want to keep, otherwise make sure everything else found is selcted. Click "Fix selected issues ... " down at the bottom right of the page. Confirm, and when prompted to create a backup, do so, and note where the backup will be saved. Another "Fix all issues?" box then will pop up, select "Fix all issues", and confirm.
When that has completed, select "Cleaner (the whiskbroom icon at the top). In the "Windows" tab, make sure everything is selected, then click the "Analyze" button down at the bottom left of that page. Be patient, this will take a while. When that has completed, click the "Run Cleaner" button down at the bottom righthand side of the page, and confirm.
When that has completed, reboot into safe mode, relaunch CCleaner, select "Issues", and run another scan and clean as above. Following that, select "Cleaner" and repeat that process as above.
Now, reboot normally, and connect to the internet (if you want to). The problem program should be totally gone. Your cookies, temp files, and caches will be emptied as well; your machine likely will seem faster and more responsive, though you'll hafta manually log on to any sites you had set up for autmatic log-on - a minor hassle, and worth the effort for the overall benefit.