I had the same problem, until i uninstalled Limewire. then i got this:

LimeWire version 4.8.1
Java version 1.5.0_02 from Sun Microsystems Inc.
Windows XP v. 5.1 on x86
Free/total memory: 3642760/4128768

com.limegroup.gnutella.gui.GUILoader$StartupFailed Exception: invalid update.ver
at com.limegroup.gnutella.gui.GUILoader.sanityCheck(G UILoader.java:277)
at com.limegroup.gnutella.gui.GUILoader.load(GUILoade r.java:43)
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:31)

STARTUP ERROR!

-- listing properties --
WINDOW_Y=-4
FORCE_IP_ADDRESS=true
WINDOW_X=-4
THEME_FILE=C:\Documents and Settings\CanadaJoe\....
RUN_ON_STARTUP=false
UPDATE_DELAY=25200002
FILTER_HASH_QUERIES=true
UPNP_IN_USE=true
INSTALLED=true
FORCED_IP_ADDRESS_STRING=71.240.169.21
HARD_MAX_UPLOADS=0
DISABLE_SUPERNODE_MODE=true
AVERAGE_UPTIME=7045
TOTAL_UPTIME=162050
MAX_UPLOAD_BYTES_PER_SEC=1
COUNTRY=
LAST_SHUTDOWN_TIME=1123988965046
APP_WIDTH=1152
SESSIONS=23
SHOW_TOTD=false
CLEAR_DOWNLOAD=true
UPLOADS_PER_PERSON=0
ALLOW_PARTIAL_SHARING=false
CONNECT_ON_STARTUP=false
FRACTIONAL_UPTIME=0.03690259
CONNECTION_SPEED=1000
LAST_EXPIRE_TIME=1123616622796
DIRECTORY_FOR_SAVING_FILES=C:\Documents and Settings\CanadaJoe\D...
MAX_DOWNLOAD_BYTES_PER_SEC=63
MINIMUM_SEARCH_SPEED=350
RUN_ONCE=true
APP_HEIGHT=824
DAAP_ENABLED=false
MAX_SIM_DOWNLOAD=999
DIRECTORIES_TO_SEARCH_FOR_FILES=C:\Documents and Settings\CanadaJoe\D...
LAST_GWEBCACHE_FETCH_TIME=1123616639234
UNSET_FIREWALLED_FROM_CONNECTBACK=true
CLIENT_ID=D073E61EEEF3ED7E6ED104510A18BA00
THEME_DIR=C:\Documents and Settings\CanadaJoe\....
CONNECTION_VIEW_ENABLED=true



FILES IN CURRENT DIRECTORY:
C:\Program Files\LimeWire\clink.jar
LAST MODIFIED: 1120845369484
SIZE: 627752

C:\Program Files\LimeWire\commons-httpclient.jar
LAST MODIFIED: 1120845369531
SIZE: 463786

C:\Program Files\LimeWire\commons-logging.jar
LAST MODIFIED: 1120845369546
SIZE: 59154

C:\Program Files\LimeWire\daap.jar
LAST MODIFIED: 1120845369578
SIZE: 310773

C:\Program Files\LimeWire\GenericWindowsUtils.dll
LAST MODIFIED: 1110397777750
SIZE: 12279

C:\Program Files\LimeWire\i18n.jar
LAST MODIFIED: 1120845369593
SIZE: 25678

C:\Program Files\LimeWire\icu4j.jar
LAST MODIFIED: 1120845369640
SIZE: 741440

C:\Program Files\LimeWire\id3v2.jar
LAST MODIFIED: 1120845369671
SIZE: 94430

C:\Program Files\LimeWire\jcraft.jar
LAST MODIFIED: 1120845369687
SIZE: 135834

C:\Program Files\LimeWire\jl011.jar
LAST MODIFIED: 1120845369718
SIZE: 255016

C:\Program Files\LimeWire\jmdns.jar
LAST MODIFIED: 1120845369734
SIZE: 69306

C:\Program Files\LimeWire\LimeWire.exe
LAST MODIFIED: 1110397778015
SIZE: 81920

C:\Program Files\LimeWire\LimeWire.jar
LAST MODIFIED: 1120845369171
SIZE: 5262588

C:\Program Files\LimeWire\LimeWire20.dll
LAST MODIFIED: 1110397777828
SIZE: 32768

C:\Program Files\LimeWire\logicrypto.jar
LAST MODIFIED: 1120845369750
SIZE: 227510

C:\Program Files\LimeWire\looks.jar
LAST MODIFIED: 1120845369796
SIZE: 630634

C:\Program Files\LimeWire\MessagesBundles.jar
LAST MODIFIED: 1120845369421
SIZE: 2057292

C:\Program Files\LimeWire\mp3sp14.jar
LAST MODIFIED: 1120845369812
SIZE: 40064

C:\Program Files\LimeWire\ProgressTabs.jar
LAST MODIFIED: 1120845369437
SIZE: 5964

C:\Program Files\LimeWire\themes.jar
LAST MODIFIED: 1120845369812
SIZE: 193884

C:\Program Files\LimeWire\tritonus.jar
LAST MODIFIED: 1120845369843
SIZE: 152711

C:\Program Files\LimeWire\vorbis.jar
LAST MODIFIED: 1120845369843
SIZE: 27215

C:\Program Files\LimeWire\WindowsV5PlusUtils.dll
LAST MODIFIED: 1110397777890
SIZE: 12808

C:\Program Files\LimeWire\xerces.jar
LAST MODIFIED: 1120845369984
SIZE: 2147687

C:\Program Files\LimeWire\xml-apis.jar
LAST MODIFIED: 1120845370000
SIZE: 207655