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.
Spybot - Search & Destroy - Spybot Search & Destroy is an anti-malware, adware and antivirus program for safe removal of the threats from the PC and browser.
Dropbox - Online Sync and File Sharing
Malwarebytes - Malwarebytes protects you against malware, ransomware, and other advanced online threats that have made antivirus obsolete and ineffective. Free Anti-Malware & Malware .
Google Drive - Access and sync your files anywhere
SUPERAntiSpyware - Superantispyware protects you against malware, ransomware, and spyware. Get started today with free trial and remove Spyware, Rootkits, Spyware, Adware, Worms, Parasite!
Mega - Secure File Storage and collaboration