Requirement:

• For Windows 7 Home Premium, Professional, Ultimate (32/64 Bit) 
• Intel Pentium 1 GHz 32-bit (x86) / 64-bit (x64) or higher (or a compatible equivalent)
• 1 GB of available RAM (32-bit) or 2 GB of available RAM (64-bit)

• For Windows Vista Home Basic, Home Premium, Business, Enterprise, Ultimate (32/64 bit)
• Intel Pentium 800 MHz 32 bit (x86) / 64 bit (x64) or higher (or a compatible equivalent)
• 512 MB of available RAM .

• For Windows XP Home Edition (SP2 or higher), XP Professional (SP2 or higher), XP Professional x64* Edition (SP2 or higher)
• Intel Pentium 300 MHz or higher (or a compatible equivalent)
• 256 MB of available RAM 

you can see more info and what is new and the new Features of kaspersky pure at the 

Kaspersky PURE Overview

• Fights digital pollution
  Kaspersky PURE keeps malicious content and spam at bay, whilst letting you manage access to your applications, email and the Internet. Additional security tools erase any data-trail, so hackers can’t follow.
• Protects digital assets
  Kaspersky PURE prevents your photos, music, documents, videos, etc. from becoming lost, stolen or corrupted. Advanced backup tools and the latest encryption technology mean that you decide who you share your personal data with.
• Safeguards digital identities
  Kaspersky PURE has everything you need to protect your digital identity. With a built-in virtual keyboard, the latest in anti-phishing technology and a secure password management system, it won’t let you down!
  Ensures family-safe content Kaspersky PURE puts you in charge of who uses the PC’s on your home network and what they can see and do, both online and off. Detailed reporting systems keep you fully informed and your family safe.
• Centralizes security management
  Kaspersky PURE allows you to check your network’s security status, automatically download and roll out updates from a nominated PC, log events and organize scans and backups from any point on the home network.
• Provides all-round protection
  Kaspersky PURE is the one-stop-shop for home network protection. It contains everything that you need to manage your network’s security and to keep it malware-free, without the need to be an IT expert.

1. Full antimalware and anti-spam protection, including cutting-edge Sandbox technology for guaranteed safety Enhanced.
2. My Control Centre allows centralized management of tasks, reports and updates, etc, from any networked PC NEW Feature.
3. Password Manager can create, encrypt and store logins, auto-complete forms and has an inbuilt virtual keyboard NEW Feature.
4. File Shredder uses multi-pass technology to make deleted data unrestorable, even with sophisticated software NEW Feature.
5. Data Backup & Restore assures your data’s integrity. Set schedules, restore points and select backup media NEW Feature.
6. Data Encryption maximizes security. Create, store and transfer data in password-protected, encrypted containers NEW Feature. 

It's Freeware PDF converter, allows you to easily convert any printable document to PDF