This type of Windows 7 license is known as the Dell OEM version. If Windows 7 was purchased as a full or upgrade license, you should use the retail DVD you purchased. The .iso from Digital River (step 3b) may also be used and is recommended only if the DVD doesn't have Service Pack 1. This type of Windows 7 license is known as the retail version.
Microsoft Windows 7 Service Pack 1 - Free download and Mar 15, 2011 Windows 7 Service Pack 1 (SP1) 32-bit & 64-bit (KB976932 Nov 04, 2013 Cannot install Windows 7 Service Pack 1 for x64-based Aug 09, 2011
Mar 22, 2011
How to install service pack 1 | Download service pack 1 Aug 20, 2018 Windows Installer Service - Free downloads and reviews windows installer service free download - Windows Installer 1.1 Redistributable, Windows Installer (Windows XP/2003), Windows Installer (Windows 95/98/Me), and many more programs
Installing Service under Windows 7
Jan 15, 2017 Lip Service Clock for PC/Laptop Windows(7,8,10) & Mac Free