nsis installer

when ever i download a program packaged with nsis installer , its gives a crc error fail . why does this happen. no software with nsis installer seems to work with my system. i dont seem to have any viruses. sometimes the /NCRC switch worksd. i am very frusrated.

The installers might have been corrupted during the download process. Try downloading an installer on a friend's computer, make sure it works on his and then move it to your computer not using the network.