[Hollywood]

Question Butters, is this only happening with files you are downloading? Or is it happening while installing programs off of a CD. CRC will alert you when a file appears corrupt (from a scratched CD or some other unreadable media). But, it could also be corrupt if your internet connection to the host is experiencing packet loss either on your end or while in transit. If you are using a router, the router could be bad and basically throwing away some of the good packets, although this seems unlikely.

The most obvious solution to me is to either check the media from which you are trying to install these programs, or to replace that hard drive with one you know is working. If you see no more errors, throw the old hard drive away.