HP Deskjet 3520 Inkjet Printer - Manual (Page 61)

minimum system requirements
Your computer must meet the following minimum requirements:
Microsoft Windows XP
Minimum processor speed: Pentium II 233 MHz
Required RAM: 128 MB
Required free hard disk space: 300 MB*
Microsoft Windows 98, 2000 Professional, or Me
Minimum processor speed: Pentium II 233 MHz
Required RAM: 64 MB
Required free hard disk space: 300 MB*
* If you are printing photographs or printing at 2400 x 1200 dpi, you must have
additional hard disk space available.