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Signed jar won't work...

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I signed the jar for my applet using jarsigner.
the applet is made for browsing your harddisk in order to upload some pictures so I needed a signed applet.
Anyway I signed the applet and still i get this error: access denied ( C:\Documents and Settings\josy\Mijn documenten read)
at Source)
at Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkRead(Unknown Source)
at Source)
at Source)
at com.arashpayan.filetree.FileTree.populateSubTree(
at com.arashpayan.filetree.FileTree.initRoot(
at com.arashpayan.filetree.FileTree.initComponents(
at com.arashpayan.filetree.FileTree.<init>(
at UploaderPack.Uploader.init(
at Source)
at Source)

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I haven't done it myself, but I've heard people say running code as privileged code helps. See the last paragraph of "Signing an applet" in
[ July 01, 2008: Message edited by: Ulf Dittmer ]
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I just ran an applet from a jar that I signed and it was able to read a file from my C: drive. It wasn't able to read the file before I signed it.

Here are the commands I used to sign the jar file:

@REM Sign AppletReader.jar to new jar file
@rem commandline used to create keystore:
@echo keytool -genkey -alias signApplet -keypass NormsKey -keystore NormsKS -storepass NormsStore
jarsigner -keystore NormsKS -signedjar sAppletReader.jar AppletReader.jar signApplet

Here's the code in the applet:
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