Installation LS failed. Corrupted Disk??

Question

I tried to install Snow Leopard last week (upgrading), but with still 46 minutes to go.I got message to clean the disk and try again. Which I did several times. Same error.
I tried via start holding "c" and starting up from installation disk, but after a while I got message that files could not be copied etc...
I used disk utilities to verify disk and permissions, but disk seems to be Ok according Disk Utility.
When I looked into the log files it shows 5 warnings about SUID files that has been modified and were not repaired.
Maybe somebody can explain (regarding permissions differ etc........ and the 5 warnings regarding SUID files) and if I have to worry or have to take action.
Is it just a problem of corrupted installation disk? or of my system somehow?
I have inserted a part of the disk utility log to illustrate.
r-- .
2009-09-07 01:29:46 +0700: Permissions differ on "System/Library/PreferencePanes/QuickTime.prefPane/Contents/Resources/QTPlugIn. prefPane/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
2009-09-07 01:29:46 +0700: Permissions differ on "System/Library/PreferencePanes/QuickTime.prefPane/Contents/Resources/QTRegiste r.prefPane/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
2009-09-07 01:29:46 +0700: Permissions differ on "System/Library/PreferencePanes/QuickTime.prefPane/Contents/Resources/QTRegiste r.prefPane/Contents/Resources/QTAbout.bundle/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
2009-09-07 01:29:46 +0700: Permissions differ on "System/Library/PreferencePanes/QuickTime.prefPane/Contents/Resources/QTStreami ng.prefPane/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
2009-09-07 01:29:46 +0700: Permissions differ on "System/Library/PreferencePanes/QuickTime.prefPane/Contents/Resources/QTUpdate. prefPane/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
2009-09-07 01:29:53 +0700: Permissions differ on "Applications/iTunes.app/Contents/CodeResources", should be -rw-rw-r-- , they are lrw-rw-r-- .
2009-09-07 01:29:53 +0700: Permissions differ on "Applications/iTunes.app/Contents/Frameworks/InternetUtilities.bundle/Contents/ CodeResources", should be -rw-rw-r-- , they are lrw-rw-r-- .
2009-09-07 01:29:55 +0700: Permissions differ on "Applications/iTunes.app/Contents/Resources/iTunesHelper.app/Contents/CodeResou rces", should be -rw-rw-r-- , they are lrw-rw-r-- .
2009-09-07 01:30:45 +0700: Warning: SUID file "System/Library/PrivateFrameworks/DiskManagement.framework/Versions/A/Resources /DiskManagementTool" has been modified and will not be repaired.
2009-09-07 01:30:46 +0700: Warning: SUID file "System/Library/PrivateFrameworks/DesktopServicesPriv.framework/Versions/A/Reso urces/Locum" has been modified and will not be repaired.
2009-09-07 01:30:46 +0700: Warning: SUID file "System/Library/Extensions/webdavfs.kext/Contents/Resources/loadwebdav" has been modified and will not be repaired.
2009-09-07 01:30:47 +0700: Permissions differ on "System/Library/CoreServices/Menu Extras/RemoteDesktop.menu/Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r-- .
2009-09-07 01:30:49 +0700: Warning: SUID file "usr/sbin/pppd" has been modified and will not be repaired.
2009-09-07 01:30:49 +0700: Warning: SUID file "usr/sbin/vpnd" has been modified and will not be repaired.
2009-09-07 01:30:54 +0700:
2009-09-07 01:30:54 +0700: Permissions repair complete
2009-09-07 01:30:54 +0700:
2009-09-07 01:30:54 +0700:
Thanks in advance
Hans

Answer 1

I think you are using good judgment. But, in case you decide to install given a safe way to do so, then here is a safe way.
In your place, I would move to SL if, and only if, I had an external drive with a bootable clone of my internal on it and had my files backed up in some other secure place. I think that there is enough risk in going to SL that such conservatism is warranted. I would not use time machine alone for backup/restoring. This app can be problematic and, consequently, its solo use is too risky for me. You will be able to extract your settings, files, and programs from your clone if you do an erase and install.
To erase and install (see upgrade option below), start up to your DVD and stop after selecting your language. Use the menus to start Disk Utility and erase your drive. Quit Disk Utility and proceed with your installation. At the end, you will be able to choose to reclaim your settings, files, and apps from the clone (plug in the external at the point of the last install restart).
If you do not like SL, then you can restore your internal using the clone. I would do all cloning and related restoration with SuperDuper or some other up-to-date cloning app. Your clone also will serve as an independent backup for your data.
Upgrading is a very sound process on a Mac. Still, I also would insist on having a bootable clone on an external before upgrading. An upgrade is performed by installing over your existing installation from the desktop or having started from your SL DVD. All your programs, data, and settings will be present after an upgrade, but incompatible programs will be archived.