If you have obtained an ISO, the most reliable way to install it is via a bootable USB drive:

"All-in-One" ISOs often include both x86 (32-bit) and x64 (64-bit) versions in a single installer.

Click "Start." Note that this will erase all data on the USB drive.

This is the standard tool for creating bootable media. You can find it at Rufus.ie .

To run a optimized version of Windows 7 Ultimate SP1, your hardware should meet these minimum benchmarks: 32-bit (x86) 64-bit (x64) 1 GHz or faster 1 GHz or faster RAM Storage 16 GB free space 20 GB free space Graphics DirectX 9 with WDDM 1.0 DirectX 9 with WDDM 1.0 Sources: AVADirect , TechTarget How to Create a Bootable USB

Windows 7 Ultimate SP1 Faster Performance Edition (x86/x64) While Windows 7 reached its end of life years ago, many enthusiasts still seek out "Performance Editions" or "Lite" ISOs to breathe new life into older hardware. These custom editions are often stripped of unnecessary background services and telemetry to provide a snappier experience. Key Features of Performance Editions

Insert a USB flash drive with at least 8 GB of storage.