To put it in perspective:
A Windows 7 Ultimate 64-bit ISO "highly compressed" to is almost certainly fake or malicious . Windows 7 Ultimate 64 Bit Highly Compressed 10mb
These are operating systems that fit in small spaces, are completely free, and secure. To put it in perspective: A Windows 7
If you are looking for a genuine version of Windows 7 Ultimate, ensure it matches these real-world requirements: : A standard ISO file is approximately 4.6GB to 5.5GB . RAM : Minimum 2GB for the 64-bit version. Disk Space : At least 20GB of free space for installation. are completely free