This is what comes up whenever I try to start it
Bootstrap (v5)
Current time is Feb 22, 2014 1:36:24 PM
System.getProperty('os.name') == 'Windows 7'
System.getProperty('os.version') == '6.1'
System.getProperty('os.arch') == 'x86'
System.getProperty('java.version') == '1.7.0_51'
System.getProperty('java.vendor') == 'Oracle Corporation'
System.getProperty('sun.arch.data.model… == '32'
FATAL ERROR: java.lang.NoClassDefFoundError: sun/security/validator/KeyStores
at sun.security.ssl.X509TrustManagerImpl.<i… Source)
at sun.security.ssl.TrustManagerFactoryImpl… Source)
at sun.security.ssl.TrustManagerFactoryImpl… Source)
at javax.net.ssl.TrustManagerFactory.init(U… Source)
at sun.security.ssl.SSLContextImpl$DefaultS… Source)
at sun.security.ssl.SSLContextImpl$DefaultS… Source)
at sun.reflect.NativeConstructorAccessorImp… Method)
at sun.reflect.NativeConstructorAccessorImp… Source)
at sun.reflect.DelegatingConstructorAccesso… Source)
at java.lang.reflect.Constructor.newInstanc… Source)
at java.lang.Class.newInstance(Unknown Source)
at java.security.Provider$Service.newInstan… Source)
at sun.security.jca.GetInstance.getInstance… Source)
at sun.security.jca.GetInstance.getInstance… Source)
at javax.net.ssl.SSLContext.getInstance(Unk… Source)
at javax.net.ssl.SSLContext.getDefault(Unkn… Source)
at javax.net.ssl.SSLSocketFactory.getDefaul… Source)
at javax.net.ssl.HttpsURLConnection.getDefa… Source)
at javax.net.ssl.HttpsURLConnection.<init>(… Source)
at sun.net.www.protocol.https.HttpsURLConne… Source)
at sun.net.www.protocol.https.Handler.openC… Source)
at java.net.URL.openConnection(Unknown Source)
at net.minecraft.bootstrap.Downloader.getCo…
at net.minecraft.bootstrap.Downloader.run(D…
at net.minecraft.bootstrap.Bootstrap.execut…
at net.minecraft.bootstrap.Bootstrap.main(B…
Please fix the error and restart.