General demands: 

• 375 MB free space on the hard disk
• CD-ROM (to install the product from the CD-distributive) 
• Internet connection (to activate the product) 
• Computer mouse 
• Microsoft Internet Explorer 6.0 or above (to update anti-virus databases and application modules on the Internet) 
• Microsoft Windows Installer 2.0 or above

Operating systems: 

• Microsoft Windows XP Home Edition (Service Pack 2 and above) 
• Microsoft Windows XP Professional (Service Pack 2 and above) 
• Microsoft Windows XP Professional x64 Edition (Service Pack 2 and above) 
• Intel Pentium 300 MHz or above (or compatible) 
• 256 MB available RAM 
• Microsoft Windows Vista Home Basic (32/64 bit) 
• Microsoft Windows Vista Home Premium (32/64 bit) 
• Microsoft Windows Vista Business (32/64 bit) 
• Microsoft Windows Vista Enterprise (32/64 bit) 
• Microsoft Windows Vista Ultimate (32/64 bit) 
• Intel Pentium 800 MHz 32-bit (x86) / 64-bit(x64) or above (or compatible). 
• 512 MB available RAM.
• Microsoft Windows 7 Home Premium (32/64 bit)
• Microsoft Windows 7 Professional (32/64 bit)
• Microsoft Windows 7 Ultimate (32/64 bit)
• Intel Pentium 1 GHz 32-bit (x86) / 64-bit(x64) or above
• 1 GB (32-bit) or 2 GB (64-bit) available RAM

Safe Run Mode doesn’t work with Microsoft Windows XP x64, and works with limitations on Microsoft Windows Vista x64 and Microsoft Windows 7 x64.