I have this problem as well, I can't seem to get it to work no matter what. Java is updated (made sure to get my version, 64x), Got techinc latest for WINDOWS 7, and repeatedly tried deleting and reinstalling. here is my crash log0.
[08:41:05] [sEVERE]------------------------------------------
[08:41:05] [sEVERE]Launcher is starting....
[08:41:05] [sEVERE]Launcher Build: '1.0.1.3'
[08:41:05] [sEVERE]Allocated 910.25 Mb of RAM
[08:41:05] [sEVERE]Java VM: '1.7.0_06-b24'
[08:41:05] [sEVERE]OS Version: '6.1'
[08:41:05] [sEVERE]Is 64-bit: 'true'
[08:41:06] [sEVERE]java.lang.NullPointerException
[08:41:06] [sEVERE]at org.spoutcraft.launcher.MirrorUtils.getMirrorUrl(MirrorUtils.java:30)
[08:41:06] [sEVERE]at org.spoutcraft.launcher.MirrorUtils.getMirrorUrl(MirrorUtils.java:76)
[08:41:06] [sEVERE]at org.spoutcraft.launcher.MD5Utils.updateMD5Cache(MD5Utils.java:71)
[08:41:06] [sEVERE]at org.spoutcraft.launcher.gui.LoginForm.loadLauncherData(LoginForm.java:360)
[08:41:06] [sEVERE]at org.spoutcraft.launcher.gui.LoginForm.<init>(LoginForm.java:133)
[08:41:06] [sEVERE]at org.spoutcraft.launcher.Main.main(Main.java:194)
[08:41:06] [sEVERE]All mirrors failed, reverting to default
[08:41:06] [sEVERE]java.lang.NullPointerException
[08:41:06] [sEVERE]at org.spoutcraft.launcher.MirrorUtils.getMirrorUrl(MirrorUtils.java:30)
[08:41:06] [sEVERE]at org.spoutcraft.launcher.MirrorUtils.getMirrorUrl(MirrorUtils.java:76)
[08:41:06] [sEVERE]at org.spoutcraft.launcher.YmlUtils.downloadYmlFile(YmlUtils.java:45)
[08:41:06] [sEVERE]at org.spoutcraft.launcher.YmlUtils.downloadRelativeYmlFile(YmlUtils.java:24)
[08:41:06] [sEVERE]at org.spoutcraft.launcher.modpacks.ModPackListYML.updateModPacksYMLCache(ModPackListYML.java:82)
[08:41:06] [sEVERE]at org.spoutcraft.launcher.modpacks.ModPackListYML.getConfig(ModPackListYML.java:72)
[08:41:06] [sEVERE]at org.spoutcraft.launcher.modpacks.ModPackListYML.getModPacks(ModPackListYML.java:108)
[08:41:06] [sEVERE]at org.spoutcraft.launcher.modpacks.ModPackListYML.<clinit>(ModPackListYML.java:60)
[08:41:06] [sEVERE]at org.spoutcraft.launcher.gui.LoginForm.loadLauncherData(LoginForm.java:361)
[08:41:06] [sEVERE]at org.spoutcraft.launcher.gui.LoginForm.<init>(LoginForm.java:133)
[08:41:06] [sEVERE]at org.spoutcraft.launcher.Main.main(Main.java:194)
[08:41:06] [sEVERE]All mirrors failed, reverting to default
[08:41:06] [sEVERE]Exception in thread "main"
[08:41:06] [sEVERE]java.lang.NullPointerException
[08:41:06] [sEVERE]at org.spoutcraft.launcher.modpacks.ModPackListYML.getAllModPackResources(ModPackListYML.java:186)
[08:41:06] [sEVERE]at org.spoutcraft.launcher.gui.LoginForm.loadLauncherData(LoginForm.java:363)
[08:41:06] [sEVERE]at org.spoutcraft.launcher.gui.LoginForm.<init>(LoginForm.java:133)
[08:41:06] [sEVERE]at org.spoutcraft.launcher.Main.main(Main.java:194)
PLZ HELP!!!!