well I upgraded to 5.1.2 today because my older version would no longer come up with any search results. everything worked fine and LW start up came on and the a got an error message...i reviewed and it said this...

LimeWire version 5.1.2
Java version 1.6.0_12 from Sun Microsystems Inc.
Windows Vista v. 6.0 on x86
Free/total memory: 48634504/66715648

FATAL ERROR!

java.lang.NoClassDefFoundError: com/sun/org/apache/xerces/internal/parsers/AbstractSAXParser
at com.sun.org.apache.xerces.internal.jaxp.SAXParserI mpl.<init>(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserF actoryImpl.newSAXParser(Unknown Source)
at com.limegroup.gnutella.xml.XMLParsingUtils$LimePar ser.<init>(XMLParsingUtils.java:125)
at com.limegroup.gnutella.xml.XMLParsingUtils*****ini tialValue(XMLParsingUtils.java:45)
at com.limegroup.gnutella.xml.XMLParsingUtils*****ini tialValue(XMLParsingUtils.java:42)
at java.lang.ThreadLocal.setInitialValue(Unknown Source)
at java.lang.ThreadLocal.get(Unknown Source)
at com.limegroup.gnutella.xml.XMLParsingUtils.parse(X MLParsingUtils.java:69)
at com.limegroup.gnutella.xml.XMLParsingUtils.parse(X MLParsingUtils.java:60)
at com.limegroup.gnutella.xml.LimeXMLDocument.<init>( LimeXMLDocument.java:112)
at com.limegroup.gnutella.xml.LimeXMLDocumentFactoryI mpl.createLimeXMLDocument(LimeXMLDocumentFactoryIm pl.java:29)
at com.limegroup.gnutella.xml.LimeXMLReplyCollection. readVersion2File(LimeXMLReplyCollection.java:880)
at com.limegroup.gnutella.xml.LimeXMLReplyCollection. readMapFromDisk(LimeXMLReplyCollection.java:806)
at com.limegroup.gnutella.xml.LimeXMLReplyCollection. <init>(LimeXMLReplyCollection.java:140)
at com.limegroup.gnutella.xml.LimeXMLReplyCollectionF actoryImpl.createLimeXMLReplyCollection(LimeXMLRep lyCollectionFactoryImpl.java:37)
at com.limegroup.gnutella.xml.SchemaReplyCollectionMa pper.loadSchemas(SchemaReplyCollectionMapper.java: 206)
at com.limegroup.gnutella.xml.SchemaReplyCollectionMa pper.access$000(SchemaReplyCollectionMapper.java:3 1)
at com.limegroup.gnutella.xml.SchemaReplyCollectionMa pper*****initialize(SchemaReplyCollectionMapper.ja va:88)
at org.limewire.lifecycle.ServiceRegistryImpl$Service Holder$AnnotatedService.initialize(ServiceRegistry Impl.java:195)
at org.limewire.lifecycle.ServiceRegistryImpl$Service Holder.init(ServiceRegistryImpl.java:151)
at org.limewire.lifecycle.ServiceRegistryImpl.initial ize(ServiceRegistryImpl.java:54)
at com.limegroup.gnutella.LifecycleManagerImpl.instal lListeners(LifecycleManagerImpl.java:96)
at com.limegroup.gnutella.LifecycleManagerImpl.loadBa ckgroundTasksBlocking(LifecycleManagerImpl.java:12 0)
at com.limegroup.gnutella.LifecycleManagerImpl.doStar t(LifecycleManagerImpl.java:172)
at com.limegroup.gnutella.LifecycleManagerImpl.start( LifecycleManagerImpl.java:134)
at org.limewire.ui.swing.Initializer.startCore(Initia lizer.java:561)
at org.limewire.ui.swing.Initializer.initialize(Initi alizer.java:161)
at org.limewire.ui.swing.GuiLoader.load(GuiLoader.jav a:81)
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 org.limewire.ui.swing.Main.main(Main.java:43)


-- listing session information --
Current thread: main
Active Threads: 18
Uptime: 0:10
Is Connected: false
Number of Ultrapeer -> Ultrapeer Connections: 0
Number of Ultrapeer -> Leaf Connections: 0
Number of Leaf -> Ultrapeer Connections: 0
Number of Old Connections: 0
Acting as Ultrapeer: false
Acting as Shielded Leaf: false
Number of Active Uploads: 0
Number of Queued Uploads: 0
Number of Active Managed Downloads: 0
Number of Active HTTP Downloaders: 0
Number of Waiting Downloads: 0
Received incoming this session: false
Number of Managed Files: 0
Number of Mounted Friend Files: 0
Number of Shared Files: 0
Guess Capable: false
Received Solicited UDP: false
SIMPP version: 57
Port Stable: true
FWT Capable: false
Last Reported Port: 0
External Port: 6346
IP Pongs Received: 0
Number of Content Response URNs: 0
Number of CreationTimeCache URNs: 0
VF Byte Cache Size: 0
VF Verify Cache Size: 0
VF Queue Size: 0
ByteBuffer Cache Size: 0
Number of Waiting Sockets: 0
Number of Pending Timeouts: 0
Peak Number of Thread: 25
Number of SP2 Workarounds: 0
System Load Avg: -1.0
Objects Pending GC: 0
Free Space In Settings: 203211091968
Free Space In Incomplete: 203211091968
Free Space In Downloads: 203211091968
Heap Memory Usage: init = 67108864(65536K) used = 18110896(17686K) committed = 66715648(65152K) max = 266403840(260160K)
Non-Heap Memory Usage: init = 12746752(12448K) used = 40839904(39882K) committed = 41025536(40064K) max = 100663296(98304K)
SlotManager dump:: active:0:0 1:0 2:0 queued:0:0 1:0 2:0 resumable:0:0 1:0 2:0 bw now:0.0 session avg:0.0
Number of select calls: 2
Number of immediate selects: 0
Average time in select: 4589525903

-- listing threads --
RefQueueWorker@org.apache.http.impl.conn.tsccm.Con nPoolByRoute@e28a61: 1
Timer-0: 1
AWT-Shutdown: 1
RefQueueWorker@org.apache.http.impl.conn.tsccm.Con nPoolByRoute@138ec91: 1
Deadlock Detection Thread: 1
main: 1
SwingWorker-pool-10795482-thread-1: 1
FirewallEventThread: 1
AWT-EventQueue-0: 1
Mozilla: 1
Image Fetcher 0: 1
Image Fetcher 1: 1
UDPSocketChannelConnectionEvent: 1
AWT-Windows: 1
NIODispatcher: 1
IdleThread: 1
Image Fetcher 2: 1
Image Fetcher 3: 1


-- listing properties --
DHT_NODE_ID=6C19B4C2B278409A921CB5BC51E692462F63FC 53
PORT=13381
TOTAL_CONNECTION_TIME=78954238
RUN_ON_STARTUP=false
ACTIVE_DHT_ROUTETABLE_VERSION=1
ENABLE_DHT_ALT_LOC_QUERIES=true
FILTER_HASH_QUERIES=true
DISABLE_DHT_NETWORK=false
MAX_ALTS_PER_RESPONSE=11
PUBLISH_ALT_LOCS=true
AVERAGE_UPTIME=1228
TOTAL_UPTIME=81109
SEND_LIME_RESPONSES=0.999f
MAX_UPLOAD_BYTES_PER_SEC=8
DISABLE_OOB_V2=0.999f
POSITIONS_SET=true
COUNTRY=
LAST_SHUTDOWN_TIME=1241641387678
WINDOW_X_V5=208
ENABLE_PASSIVE_LEAF_DHT_MODE=true
SESSIONS=67
SHOW_TOTD=false
PRO_ADS=For Turbo-Charged searches get LimeWi...
FILTERED_URNS_REMOTE=24V5V4JUTOMJZVKVGQBLW4FTFWUXE FH7;2ATW...
MAX_ALTS_TO_DISPLAY=2
DHT_MODE=PASSIVE_LEAF
ENABLE_PASSIVE_DHT_MODE=true
MAX_SKIP_ACKS=2
OOB_REDUNDANCY=true
LAST_ACCEPTABLE_BUG_VERSION=4.17.6
FRACTIONAL_UPTIME=9.841039E-4
LIME_QRP_ENTRIES=lime;wire;limewire;pro;limewirepr o
PREVIOUS_SHUTDOWN_WAS_GRACEFUL=false
LAST_EXPIRE_TIME=1241638527779
TOTAL_CONNECTIONS=103
MIN_PASSIVE_LEAF_DHT_INITIAL_UPTIME=300000
MAX_DOWNLOAD_BYTES_PER_SEC=5
DHT_BOOTSTRAP_HOSTS=76.8.67.27:6002
AVERAGE_CONNECTION_TIME=766546
CRAWLER_IPS=76.8.67.27;
WINDOW_Y_V5=51
MAX_DHT_ALT_LOC_QUERY_ATTEMPTS=500
PUBLISH_PUSH_PROXIES=true
MIN_PASSIVE_LEAF_DHT_AVERAGE_UPTIME=60000
CURRENTLY_RUNNING=true
MAX_SIM_DOWNLOAD=8
INSPECTOR_IPS=76.8.67.27
ENABLE_PUSH_PROXY_QUERIES=true
CUSTOM_FD_CRITERIA=ups;atUpSet;<;cups;cUpSet;<;OR; NOT;la...
CLIENT_ID=3BD107235312ABA82F3DBF1D42600000
HOSTILE_IPS=114.48.0.0/16;114.51.0.0/16;115.125.7...
MIN_ACTIVE_DHT_INITIAL_UPTIME=3600000
LAST_N_UPTIMES=360;300;180;360;300;300;840;480;360 ;3...
IDLE_CONNECTIONS=2
MIN_ACTIVE_DHT_AVERAGE_UPTIME=1800000


Ive looked around for an answer on the forums and I found that changing the compatibility to windows 2000 suggestion...i tried it and it didnt work. Ive tried uninstalling and reinstalling like 15 times, ive rebooted, everything i can think of i have tried. any help?

Thanks!