on iMac 21.5 late 2009 running Lion, partitioned new HD (due to drive failure) with 150 GB FAT format partition. Then booted up with my purchased Windows 7 full version Home Premium disc. Note: I successfully partitioned, installed, and used Win7 on my original HD on this computer, with no problem. The Windows 7 screen came up, and installation started. I selected "custom install" and "format" options (NTSF), and selected "bootcamp..." from the file list. It copied the files from the install disc, then started the "expand file" step. Looked like about 1/2 to 3/4 way thru the step got a 0x80070017 corrupt or missing file error, with no way to recover. I went to MS help with the problem, and received advice to download Win7 with SP1 ISO and try to install that. I did the download, but am getting nowhere with trying to install from the disc. I would gratefully appreciate any suggestions as to how to proceed. Thank you.