eMac Finder Flashes when keys are touched !

[Oca]

Hi,
Recently installed X10.4.11 in a eMac 700mHz combo with 640mB ram.
All went well till the Finder started to flash.
When nothing is open, and/or finder is active, the simple use of any key makes the Finder menu disappear. Same when Hard disk window is open, and I try to scroll it using the up or down cursor keys!!
Tried reset PRam, but nothing new.
Also, Safari, iCall, Adium, Mail, etc, they all quit, some time or another.
Any sugestion?

I get this (just a part of it):

--------------------------------------------------console--------------------

OS Version: 10.4.11 (Build 8S165)
Report Version: 4

Command: Finder
Path: /System/Library/CoreServices/Finder.app/Contents/MacOS/Finder
Parent: WindowServer [54]

Version: 10.4.7 (10.4.7)
Build Version: 1
Project Name: Finder_FE
Source Version: 5292900

PID: 201
Thread: 0

Exception: EXC_BAD_ACCESS (0x0001)
Codes: KERN_PROTECTION_FAILURE (0x0002) at 0x00000020

Thread 0 Crashed:
0 <<00000000>> 0xfffeff18 objc_msgSend_rtp + 24
1 com.apple.Foundation 0x92c98e48 -[NSDictionary initWithObjects_ex:forKeys:count:] + 44
2 com.apple.HIToolbox 0x933c07f4 SendUnicodeTextAEToUnicodeDoc + 804
3 com.apple.HIToolbox 0x933c029c utDeliverTSMEvent + 1024
4 com.apple.HIToolbox 0x933bfe80 TSMKeyEvent + 88
5 com.apple.HIToolbox 0x93376b34 TSMProcessRawKeyEvent + 920
6 com.apple.HIToolbox 0x933765fc HandleCompatibilityKeyEvent(OpaqueEventRef*) + 308
7 com.apple.HIToolbox 0x932a96a4 HIApplication::EventHandler(OpaqueEventHandlerCallRef*, OpaqueEventRef*, void*) + 788
8 com.apple.HIToolbox 0x932ac934 DispatchEventToHandlers(EventTargetRec*, OpaqueEventRef*, HandlerCallRec*) + 692
9 com.apple.HIToolbox 0x932ac08c SendEventToEventTargetInternal(OpaqueEventRef*, OpaqueEventTargetRef*, HandlerCallRec*) + 372
10 com.apple.HIToolbox 0x932abf08 SendEventToEventTargetWithOptions + 40
11 com.apple.HIToolbox 0x933762a4 HandleKeyboardEvent(OpaqueEventRef*, unsigned long) + 352
12 com.apple.HIToolbox 0x932b320c ToolboxEventDispatcherHandler(OpaqueEventHandlerCallRef*, OpaqueEventRef*, void*) + 512
13 com.apple.HIToolbox 0x932acb84 DispatchEventToHandlers(EventTargetRec*, OpaqueEventRef*, HandlerCallRec*) + 1284
14 com.apple.HIToolbox 0x932ac08c SendEventToEventTargetInternal(OpaqueEventRef*, OpaqueEventTargetRef*, HandlerCallRec*) + 372
15 com.apple.HIToolbox 0x932b2e90 SendEventToEventTarget + 40
16 com.apple.HIToolbox 0x932f3c04 ToolboxEventDispatcher + 92
17 com.apple.HIToolbox 0x932f3b90 HLTBEventDispatcher + 16
18 com.apple.HIToolbox 0x932f2148 RunApplicationEventLoop + 148
19 com.apple.finder 0x00008960 0x1000 + 31072
20 com.apple.finder 0x00004f18 0x1000 + 16152
21 com.apple.finder 0x00069ff0 0x1000 + 430064
22 com.apple.finder 0x00069e98 0x1000 + 429720
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