Installing from full Retail Version of Microsoft Office 2003 Professional Edition. Answered "yes" to check the internet for updates and delete installation files. Installation files deleted from c:\ cache before this error came up. Dialogue box asks you to insert the CD-Rom - it has been inserted yet Microsoft cannot find the file. No file w/that name found on search including sub-folders. No file found w/that name searching hard drive. Waiting on hold with Microsoft Tech Support (20 min hold time). Hoping there's a quicker answer out there.