When I start Minecraft (just with Forge), I just get an error.

I get this in ForgeModLoader-client-0

2012-12-25 14:25:03 [iNFO] [ForgeModLoader] Forge Mod Loader version 4.6.14.513 for Minecraft 1.4.6 loading
2012-12-25 14:25:03 [FINEST] [ForgeModLoader] All core mods are successfully located
2012-12-25 14:25:03 [FINEST] [ForgeModLoader] Discovering coremods
2012-12-25 14:25:03 [FINEST] [ForgeModLoader] Found library file argo-2.25.jar present and correct in lib dir
2012-12-25 14:25:03 [FINEST] [ForgeModLoader] Found library file guava-12.0.1.jar present and correct in lib dir
2012-12-25 14:25:03 [FINEST] [ForgeModLoader] Found library file asm-all-4.0.jar present and correct in lib dir
2012-12-25 14:25:03 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/bcprov-jdk15on-147.jar
2012-12-25 14:25:03 [iNFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/bcprov-jdk15on-147.jar
2012-12-25 14:25:08 [sEVERE] [ForgeModLoader] There was a problem downloading the file bcprov-jdk15on-147.jar automatically. Perhaps you have an environment without internet access. You will need to download the file manually or restart and let it try again

2012-12-25 14:25:08 [sEVERE] [ForgeModLoader] There were errors during initial FML setup. Some files failed to download or were otherwise corrupted. You will need to manually obtain the following files from these download links and ensure your lib directory is clean. 
2012-12-25 14:25:08 [sEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/argo-2.25.jar
2012-12-25 14:25:08 [sEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/guava-12.0.1.jar
2012-12-25 14:25:08 [sEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/asm-all-4.0.jar
2012-12-25 14:25:08 [sEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/bcprov-jdk15on-147.jar
2012-12-25 14:25:08 [sEVERE] [ForgeModLoader] <===========>
2012-12-25 14:25:08 [sEVERE] [ForgeModLoader] The following is the errors that caused the setup to fail. They may help you diagnose and resolve the issue
2012-12-25 14:25:08 [sEVERE] [ForgeModLoader] A download error occured
2012-12-25 14:25:08 [sEVERE] [ForgeModLoader] <<< ==== >>>
2012-12-25 14:25:08 [sEVERE] [ForgeModLoader] The following is diagnostic information for developers to review.
2012-12-25 14:25:08 [sEVERE] [ForgeModLoader] Error details
java.lang.RuntimeException: A download error occured
at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:483)
at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:132)
at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:155)
at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:242)
at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:212)
at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)
at net.minecraft.Launcher.replace(Launcher.java:143)
at net.minecraft.Launcher$1.run(Launcher.java:87)
Caused by: java.net.SocketTimeoutException: Read timed out
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:467)
... 7 more
Caused by: java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at java.io.BufferedInputStream.fill(Unknown Source)
at java.io.BufferedInputStream.read1(Unknown Source)
at java.io.BufferedInputStream.read(Unknown Source)
at sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source)
at sun.net.www.http.HttpClient.parseHTTP(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(Unknown Source)
at java.net.URLConnection.getHeaderFieldLong(Unknown Source)
at java.net.URLConnection.getContentLengthLong(Unknown Source)
at java.net.URLConnection.getContentLength(Unknown Source)
at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:466)
... 7 more
2012-12-25 14:25:09 [iNFO] [sTDERR] Exception in thread "Thread-5" java.lang.RuntimeException: java.lang.RuntimeException: A fatal error occured and FML cannot continue
2012-12-25 14:25:09 [iNFO] [sTDERR] 	at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:175)
2012-12-25 14:25:09 [iNFO] [sTDERR] 	at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:242)
2012-12-25 14:25:09 [iNFO] [sTDERR] 	at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:212)
2012-12-25 14:25:09 [iNFO] [sTDERR] 	at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)
2012-12-25 14:25:09 [iNFO] [sTDERR] 	at net.minecraft.Launcher.replace(Launcher.java:143)
2012-12-25 14:25:09 [iNFO] [sTDERR] 	at net.minecraft.Launcher$1.run(Launcher.java:87)
2012-12-25 14:25:09 [iNFO] [sTDERR] Caused by: java.lang.RuntimeException: A fatal error occured and FML cannot continue
2012-12-25 14:25:09 [iNFO] [sTDERR] 	at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:228)
2012-12-25 14:25:09 [iNFO] [sTDERR] 	at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:155)
2012-12-25 14:25:09 [iNFO] [sTDERR] 	... 5 more

Read EAQ.

I read it and now? Its still not working.

The file server is changing servers due to it getting... 'large'.

The EAQ should tell you how to download and install the files manually until the move is complete.

I installed this files but its still not working.

Okay it works now