For hosting common files it's ok. Also it is on Android too do, great to transfer files between your Windows and your phone. But if you want better security you have to subscribe a monthly offer.
CCleaner - CCleaner cleans, speeds up and frees up space on business endpoints.
Dropbox - Online Sync and File Sharing
Glary Utilities - The No. 1 Free, Powerful and All-in-one utility for cleaning your PC
Google Drive - Access and sync your files anywhere
AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode
Mega - Secure File Storage and collaboration