Link para download direto do site da Microsoft para os instaladores do Windows 7 ORIGINAL:

Windows 7 Home Premium (32 bits)

https://download.microsoft.com/download/E/D/A/EDA6B508-7663-4E30-86F9-949932F443D0/7601.24214.180801-1700.win7sp1_ldr_escrow_CLIENT_HOMEPREMIUM_x86FRE_en-us.iso

Windows 7 Home Premium (64 bits)

https://download.microsoft.com/download/E/A/8/EA804D86-C3DF-4719-9966-6A66C9306598/7601.24214.180801-1700.win7sp1_ldr_escrow_CLIENT_HOMEPREMIUM_x64FRE_en-us.iso

Windows 7 Professional (32 bits)

https://download.microsoft.com/download/C/0/6/C067D0CD-3785-4727-898E-60DC3120BB14/7601.24214.180801-1700.win7sp1_ldr_escrow_CLIENT_PROFESSIONAL_x86FRE_en-us.iso

Windows 7 Professional (64 bits)

https://download.microsoft.com/download/C/0/6/C067D0CD-3785-4727-898E-60DC3120BB14/7601.24214.180801-1700.win7sp1_ldr_escrow_CLIENT_PROFESSIONAL_x86FRE_en-us.iso

Windows 7 Ultimate (32 bits)

https://download.microsoft.com/download/1/E/6/1E6B4803-DD2A-49DF-8468-69C0E6E36218/7601.24214.180801-1700.win7sp1_ldr_escrow_CLIENT_ULTIMATE_x86FRE_en-us.iso

Windows 7 Ultimate (64 bits)

https://download.microsoft.com/download/5/1/9/5195A765-3A41-4A72-87D8-200D897CBE21/7601.24214.180801-1700.win7sp1_ldr_escrow_CLIENT_ULTIMATE_x64FRE_en-us.iso

Instalando software original você previne seu computador de ser infectado através de softwares maliciosos inseridos dentro do instalador do sistema operacional. Instale somente softwares originais.