How to Remove an NSIS Error
The NSIS error occurs during software installation when the integrity check fails. This error then corrupts the installation process. If the installation continues, it would not install correctly. The NSIS error can be fixed in a few short steps.
Click "Start," type "cmd" in the search field and then press "Enter." This will open a blank window.
Drag and drop the installation file icon into this blank window. The installation file is an executable file with the .exe extension. For example, if you downloaded a program and saved it to your desktop, it will create an installation icon. You need to drag that icon into the blank window. After you drag the installation file into the blank window, the path shows up on the screen.
Click anywhere in the blank window, and you will notice the cursor flashing at the end of the path. Press the space bar and type /NCRC and press "Enter." For example, if you were downloading Yahoo messenger the path would look like this http://download.yimg.com/ycs/msg/dl/msgr10/us/r6/msgr10us.exe /NCRC. The installation will begin and will not receive the NSIS error.