mail, ical, and address book crash loading ISSupport

[Rocco83]

hi.

i have problem with:
- ical
- mail
- address book

before this:
- installed 4.1b3 windowshade, removed and upgraded to 4.1.1.
- added calendars to ical, and added some entry

after that:
disabled Application Enancher at login, so i am excluding it.

all crash within 3 seconds from start.
the error is the same for all programs:
****
Host Name: computer-di-[masked]
Date/Time: 2006-11-29 02:55:55.528 +0100
OS Version: 10.4.8 (Build 8L2127)
Report Version: 4

Command: Mail
Path: /Applications/Mail.app/Contents/MacOS/Mail
Parent: bash [974]

Version: 2.1.1 (752.3)

PID: 1003
Thread: Unknown

Link (dyld) error:

Library not loaded: /System/Library/PrivateFrameworks/ISSupport.framework/Versions/A/ISSupport
Referenced from: /Applications/Mail.app/Contents/MacOS/Mail
Reason: no suitable image found. Did find:
/System/Library/PrivateFrameworks/ISSupport.framework/Versions/A/ISSupport: file to short

---

ISSupport is an empty file.

So, i tried to move out ISSupport.

**********

Host Name: computer-di-[masked]
Date/Time: 2006-11-28 18:35:17.487 +0100
OS Version: 10.4.8 (Build 8L2127)
Report Version: 4

Command: Mail
Path: /Applications/Mail.app/Contents/MacOS/Mail
Parent: WindowServer [1109]

Version: 2.1.1 (752.3)

PID: 1278
Thread: Unknown

Link (dyld) error:

Library not loaded: /System/Library/PrivateFrameworks/ISSupport.framework/Versions/A/ISSupport
Referenced from: /Applications/Mail.app/Contents/MacOS/Mail
Reason: image not found

----

i have already tried to login with different user and start.
i tried to apple+option+r+p at boot.

what else can i do?
what is ISSupport? how can i reinstall it, and why i need it (if i have to)?

thanks
daniele