About uninstallAll3x4x5xIgorKeys.reg To solve some problems with uninstalling Igor 3, 4 or 5 (which may prevent you from installing Igor 5 correctly) you can completely remove all traces of Igor from your computer by following these instructions. Uninstall Igor by either: Selecting Remove Igor Pro from the Igor Pro program group, or Open the Add/Remove Programs control panel, select Igor Pro from the list, and click the Add/Remove button. This may leave traces of the Igor installation in the Windows registry. You can remove these registry entries by right-clicking uninstallAll3x4x5xIgorKeys.reg, and choosing Merge from the resulting popup menu. You can then remove Igor's installation directory, typically C:\Program Files\WaveMetrics\Igor Pro Folder. Now Igor is completely removed from your computer. This is a good way to prepare for a "clean installation" of the Igor that is included on this CD-ROM.