I am Makarand P from the Dell Social Media and Communities team.
With regards to your issue, i feel it could be a spyware problem which could be tracking the movements of the mouse and clicks. Try using Super anti-spyware to remove all the spyware. Also if this is a laptop computer, you could update the touch pad drivers and also check in device manager for the mouse option. Check whether it has a yellow exclamation mark beside it which indicates a problem either with the device or its driver. Super anti-spyware is a freeware and can be downloaded from www.download.com.
To make your computer faster, click start and type"msconfig" and click on the startup tab and remove check marks from all items except Intel services and Microsoft services. This should ensure speedy boot up time.
Alternatively try running a scan of malware-bytes to check for any other virus. This is also a freeware. To clean up junk files, also run a scan of Ccleaner.
Kindly revert for further clarifications,
Thanks and regards,
Dell Social Media and Communities Responder.