If you are looking to run this version, your system generally needs: Windows XP (SP3), Windows 7, 8, or 10. Processor: Intel Pentium 4 or AMD Athlon 64. RAM: 1GB minimum (2GB recommended).
Instead, invest your energy in:
An "Adobe Illustrator portable CS5" is a modified version of the original software designed to run from a USB drive or without installation. If you are looking to run this version,