You may trust CW, and continue the installation.
To reply your question about System Requirements:
1) Recommended Configuration
2.6GHz Pentium® compatible processor or better
4GB RAM
20GB (When installing full product or updates for all architectures)
400MB on Windows system disk
DVD drive for installation
USB port for communications with target hardware
Ethernet port for communications with target hardware (optional)
2) Operational Minimum Configuration
1.8GHz Pentium® compatible processor or better
2GB RAM
20GB (When installing full product or updates for all architectures)
400MB on Windows system disk
DVD drive for installation
USB port for communications with target hardware
3) Host Operating System Support
Microsoft® Windows XP 32-bit and 64-bit (Professional Edition)
Microsoft Windows 7 32-bit and 64-bit (Home Premium Edition and Professional Edition)
Windows 8 32-bit and 64-bit (Home Premium Edition and Professional Edition)