Gnutella Forums - crashing

ive had limewire for a while and recently it started to crash. i upgraded to the newest version and i keep getting the same messages the loading screen comes on and i get a error saying:
Your save folder is not valid. it may have been disabled you may not have permission to write it, or there may be another problem. please choose a different folder.
Then i click ok and i get a fatal error sayin a fatal internal error has been found and will now exit ect. and i click review and I get this:
L
imeWire version 4.10.3
Java version 1.5.0_06 from Sun Microsystems Inc.
Windows XP v. 5.1 on x86
Free/total memory: 1059600/5668864

FATAL ERROR!

java.lang.NullPointerException
at javax.swing.ImageIcon.<init>(Unknown Source)
at javax.swing.ImageIcon.<init>(Unknown Source)
at sun.swing.WindowsPlacesBar.<init>(Unknown Source)
at com.sun.java.swing.plaf.windows.WindowsFileChooser UI.updateUseShellFolder(Unknown Source)
at com.sun.java.swing.plaf.windows.WindowsFileChooser UI.installComponents(Unknown Source)
at javax.swing.plaf.basic.BasicFileChooserUI.installU I(Unknown Source)
at com.sun.java.swing.plaf.windows.WindowsFileChooser UI.installUI(Unknown Source)
at javax.swing.JComponent.setUI(Unknown Source)
at javax.swing.JFileChooser.updateUI(Unknown Source)
at javax.swing.JFileChooser.setup(Unknown Source)
at javax.swing.JFileChooser.<init>(Unknown Source)
at javax.swing.JFileChooser.<init>(Unknown Source)
at com.limegroup.gnutella.gui.FileChooserHandler.getD irectoryChooser(FileChooserHandler.java:543)
at com.limegroup.gnutella.gui.FileChooserHandler.getI nput(FileChooserHandler.java:476)
at com.limegroup.gnutella.gui.FileChooserHandler.getI nputDirectory(FileChooserHandler.java:188)
at com.limegroup.gnutella.gui.FileChooserHandler.getI nputDirectory(FileChooserHandler.java:160)
at com.limegroup.gnutella.gui.FileChooserHandler.getI nputDirectory(FileChooserHandler.java:111)
at com.limegroup.gnutella.gui.FileChooserHandler.getI nputDirectory(FileChooserHandler.java:46)
at com.limegroup.gnutella.gui.SaveDirectoryHandler.sh owChooser(SaveDirectoryHandler.java:46)
at com.limegroup.gnutella.gui.SaveDirectoryHandler.sh owSaveDirectoryWindow(SaveDirectoryHandler.java:31 )
at com.limegroup.gnutella.gui.SaveDirectoryHandler.ha ndleSaveDirectory(SaveDirectoryHandler.java:105)
at com.limegroup.gnutella.gui.Initializer.initialize( Initializer.java:239)
at com.limegroup.gnutella.gui.GUILoader.load(GUILoade r.java:41)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknow n Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Un known Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.limegroup.gnutella.gui.Main.main(Main.java:44)

-- listing session information --
Current thread: main
Active Threads: 11

-- listing threads --
main: 1
NIODispatcher: 1
AWT-EventQueue-0: 1
AWT-Windows: 1
AWT-Shutdown: 1
Image Fetcher 1: 1
Timer-0: 1
Image Fetcher 2: 1
Java2D Disposer: 1
Image Fetcher 0: 1
TimerQueue: 1

-- listing properties --
APP_HEIGHT=984
FRACTIONAL_UPTIME=0.02535576
LAST_EXPIRE_TIME=1136526586533
SESSIONS=199
LAST_ACCEPTABLE_BUG_VERSION=4.9.40
RUN_ONCE=true
COUNTRY=
CLIENT_ID=0F795A8469510FDE748335E504D76600
FORCE_IP_ADDRESS=true
LAST_SHUTDOWN_TIME=1136954828140
FORCED_PORT=51827
IDLE_CONNECTIONS=2
TOTAL_UPTIME=1371449
PORT=51827
AVERAGE_UPTIME=6926
RUN_ON_STARTUP=false
UNSET_FIREWALLED_FROM_CONNECTBACK=true
FLUSH_DELAY_TIME=256
LAST_FWT_STATE=true
APP_WIDTH=1278
INSTALLED=true
UPNP_IN_USE=true
LAST_GWEBCACHE_FETCH_TIME=1136397867471
CONNECTION_SPEED=3000
WINDOW_Y=24
WINDOW_X=2

I Tried reinstalling 3 times and still no luck. Please help!