Consider having a Backup solution:
Macrium Reflect, Paragon Backup and Recovery Free or easeus backup free are good utilities.
Activate Windows 7 Firewall
Add CCleaner, Registry Defrag, Auslogics Registry Cleaner, Iobit Uninstaller (which happens to be portable) and finally a HDD defrag, like Puran or Auslogics and you should be good to go.