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Extract the zipped file to an easily accessible folder (Desktop or Documents). Need to use a compress/decompression tool like 7Zip for this.
From the unpacked folder "ND1000_3.8.1" run the following setup files - Need to use a compress/decompression tool like 7Zip for this.
1) ND1000/LVRuntime7/lvruntimeeng71.msi
2) ND1000/NI-VISA 4.4.1/setup.exe
3) ND1000/NanoDrop 1000 V3.8.1.msi
4) 64bitdriver/NanoDrip 1000 64bit Driver.msi
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