It sounds like you're looking for a , but I need to be upfront with you:
Even the most aggressively stripped versions of Windows 7 or 8 ("Lite" editions) rarely fall below 700MB to 1GB—still ten times the size of the proposed 100MB file. A 100MB Windows file would likely lack the necessary drivers to boot on most hardware, lacking the kernel essential for system operation. Download Windows 8 Pro Iso Highly Compressed 100mb
The Windows 8 Pro ISO file is a compressed image file that contains the installation files for the operating system. The standard ISO file size for Windows 8 Pro is around 2.5 GB, which can be a significant challenge for those with slow internet connections. highly compressed (100 MB) version of Windows 8