Hi Foobambinaift,
The other posters have some great suggestions for you. You should definitely back up your files to either a remote hard drive or an online service and you need to figure out what mechanical issue is causing the small clicking sound.
Before you hire out help or purchase new hardware (or computer) you should run a diagnostic scan to see what, if any, fixes you can make to your computer. You can use the free Norton PC Check up to run the scan if you have not run any others yet. You can access Norton PC Check through the link below.
Norton PC Check
After the scans have been completed the interface will provide you with a diagnosis and some DIY steps to resolve any issues. I hope this helps.
Regards,
Andrew Diaz
Norton Outreach
Symantec Corporation
nortonoutreach.com