How to fix drag not working on my dell xp sp3 system?

My XP system on my dell should be clean. I recently did full scans of both Webroot and Avast on it. However, I can no longer drag anything with my touchpad. Can't drag icons, nor webpages, nor the scroll bars. What could be the problem?How to fix drag not working on my dell xp sp3 system?Make sure that you have the touchpad drivers installed.