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So, I try to load up Minecraft for 1.6.1, and I get an error.

Bootstrap started
Looking for update
Didn't find an update in time.
Reversing LZMA on D:\Profiles\Tucker\Application Data\.minecraft\launcher.pack.lzma to D:\Profiles\Tucker\Application Data\.minecraft\launcher.pack
Unpacking D:\Profiles\Tucker\Application Data\.minecraft\launcher.pack to D:\Profiles\Tucker\Application Data\.minecraft\launcher.jar
Cleaning up D:\Profiles\Tucker\Application Data\.minecraft\launcher.pack
Starting launcher.
FATAL ERROR: java.lang.ClassFormatError: sun/security/x509/CertificateVersion
at sun.security.x509.X509CertInfo.<init>(Unknown Source)
at sun.security.x509.X509CertImpl.parse(Unknown Source)
at sun.security.x509.X509CertImpl.<init>(Unknown Source)
at sun.security.provider.X509Factory.engineGenerateCertificate(Unknown Source)
at java.security.cert.CertificateFactory.generateCertificate(Unknown Source)
at sun.security.pkcs.PKCS7.parseSignedData(Unknown Source)
at sun.security.pkcs.PKCS7.parse(Unknown Source)
at sun.security.pkcs.PKCS7.parse(Unknown Source)
at sun.security.pkcs.PKCS7.<init>(Unknown Source)
at sun.security.util.SignatureFileVerifier.<init>(Unknown Source)
at java.util.jar.JarVerifier.processEntry(Unknown Source)
at java.util.jar.JarVerifier.update(Unknown Source)
at java.util.jar.JarFile.initializeVerifier(Unknown Source)
at java.util.jar.JarFile.getInputStream(Unknown Source)
at sun.misc.URLClassPath$JarLoader$2.getInputStream(Unknown Source)
at sun.misc.Resource.cachedInputStream(Unknown Source)
at sun.misc.Resource.getByteBuffer(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at net.minecraft.bootstrap.Bootstrap.startLauncher(Bootstrap.java:224)
at net.minecraft.bootstrap.Bootstrap.execute(Bootstrap.java:112)
at net.minecraft.bootstrap.Bootstrap.main(Bootstrap.java:367)


Please fix the error and restart.

Any halp would be greatly appreciated.

Nevermind, I rebooted my computer, for the second time, (strangely) and it's working again.