I have been trying to install the IE 7.0 BETA on my machine without much success. The installer gets to about 45-47% and then crashes and I get a little dialog box complaining about msfeeds.dll and then interrupts the install.
A quick search of the IE blog led me to this entry that talks about how to fix this issue. It appears that the permissions on a registry key for .tif and .tiff need to be setup to allow administrator full control over the key.
So I make the change, reboot and try the install again and I still get the same error. The install log has the following error:
187.781: Copied file: C:WINDOWSsystem32wininet.dll 189.297: Copied file (delayed): C:WINDOWSsystem32SET8B.tmp 189.297: Copied file: C:WINDOWSsystem32xmllite.dll 189.500: DoInstallation: Installing assemblies with source root path: z:cb0e69a8bf80c7e39e21e7c6 189.500: Num Ticks for Copying files : 63406 190.328: DoRegistryUpdates:UpdSpInstallFromInfSection Failed for ProductInstall.GlobalRegistryChanges.Install error: 0x5 190.328: INF_REGISTRY Failed 190.328: DoInstallation:DoRegistryUpdates failed 192.063: Access is denied. 192.188: Internet Explorer 7 installation did not complete. Select 'OK' to undo the changes that have been made. 192.188: Starting process: C:WINDOWS$NtUninstallie7bet2p$spuninstspuninst.exe /~ -q -z 486.859: Software Update Rollback has completed with return code 0xbc2. This rollback requires a reboot. 486.859: Internet Explorer 7 installation did not complete. Internet Explorer 7 Beta 2 Preview has been partially updated and may not work properly. 486.859: Update.exe extended error code = 0x5