plasma workspace crashed KDE 4,1

Hi there.

Hope you can help me. I've haven't been able to use my Kubuntu 8,1 the past two months. Every time i log in a window pops up sayin "The application Plasma Workspace crashed. Signal 11 (SIGSEGV)". It says to report the error to the e-mail adress in the window. But no other app. is running and the wifi isn't connected at this time.

I don't know what to do - and i'm still a newbee at Kubuntu, so please be very specific in your answers as to how to solve my problem. I enclose the error report.

System: HP DV9780eo notebook, 3 GB RAM, 2 x 250 GB HD, Nvidia GeForce 8600M GS (? ram), dual booting Win Vista home premium SP1 DK and Kubuntu 8,10 - with every recomended update until end november 2008.

Please tell me, if you think I should send this error report somewhere else - and where...

Thanks...

Error report from the crash:

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Program: Plasma Workspace (plasma), signal SIGSEGV
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[Thread debugging using libthread_db enabled]
[New Thread 0xb480f6e0 (LWP 6331)]
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[KCrash handler]
#6 0xb723c527 in QGraphicsLinearLayout::insertItem ()
   from /usr/lib/libQtGui.so.4
#7 0xb2c19887 in ?? () from /usr/lib/kde4/plasma_applet_devicenotifier.so
#8 0xb2c19a27 in ?? () from /usr/lib/kde4/plasma_applet_devicenotifier.so
#9 0xb7de6585 in Plasma::Applet::flushPendingConstraintsEvents ()
   from /usr/lib/libplasma.so.2
#10 0xb7de6bc6 in Plasma::Applet::timerEvent () from /usr/lib/libplasma.so.2
#11 0xb770653f in QObject::event () from /usr/lib/libQtCore.so.4
#12 0xb723f447 in QGraphicsWidget::event () from /usr/lib/libQtGui.so.4
#13 0xb6c7f8ec in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#14 0xb6c8772e in QApplication::notify () from /usr/lib/libQtGui.so.4
#15 0xb7bc5b2d in KApplication::notify () from /usr/lib/libkdeui.so.5
#16 0xb76f6e61 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#17 0xb7724d81 in ?? () from /usr/lib/libQtCore.so.4
#18 0xb7721520 in ?? () from /usr/lib/libQtCore.so.4
#19 0xb5a026f8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#20 0xb5a05da3 in ?? () from /usr/lib/libglib-2.0.so.0
#21 0xb5a05f61 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#22 0xb7721478 in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#23 0xb6d19ea5 in ?? () from /usr/lib/libQtGui.so.4
#24 0xb76f552a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#25 0xb76f56ea in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#26 0xb69343eb in KIO::NetAccess::enter_loop () from /usr/lib/libkio.so.5
#27 0xb69345ec in KIO::NetAccess::statInternal () from /usr/lib/libkio.so.5
#28 0xb69353fb in KIO::NetAccess::stat () from /usr/lib/libkio.so.5
#29 0xb693547b in KIO::NetAccess::mostLocalUrl () from /usr/lib/libkio.so.5
#30 0xb2c72f1e in ?? () from /usr/lib/kde4/plasma_applet_icon.so
#31 0xb2c736ff in ?? () from /usr/lib/kde4/plasma_applet_icon.so
#32 0xb7e16737 in Plasma::Corona::loadLayout () from /usr/lib/libplasma.so.2
#33 0xb7e17531 in Plasma::Corona::initializeLayout ()
   from /usr/lib/libplasma.so.2
#34 0xb807c199 in ?? () from /usr/lib/libkdeinit4_plasma.so
#35 0xb807d880 in ?? () from /usr/lib/libkdeinit4_plasma.so
#36 0xb807fa81 in ?? () from /usr/lib/libkdeinit4_plasma.so
#37 0xb807143a in kdemain () from /usr/lib/libkdeinit4_plasma.so
#38 0x080485b2 in _start ()
#0 0xb80b8430 in __kernel_vsyscall ()

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