|You should FEED the mouse once in a while, they get jittery and "click" when they're hungry. ha ha|
Need more info - Internal laptop mouse & touchpad, or external mouse? PS/2, USB, wireless mouse?
Could be setting in XP too - Check if you use single click or aouble click. Open Windows Explorer, Tools, Folder Options, On General Tab see "Click Items as Follows" to see your setting.
Could be an application issue too, I had a strange issue with Google Calendar once where I heard rapid multiple clicking noises. It was an issue with Google Calendar.
What are you using for antivirus? Could be a virus (or keylogger?) too, but I think you'd see more symptoms from a virus than just clicking. Scan with
- A-Squared & do a Deep Scan
- MalwareBytes (Full scan).
- Scan w/ AntiRoot kits: TrendMicro Rootkit buster, Panda AntiRoot kit, Radix and/or GMER.
Just another stupid saying...