i have the updated version of java and everything but it says:
"--- BEGIN ERROR REPORT c4ae8f30 --------
Generated 7/22/10 7:26 PM

Minecraft: Minecraft Beta 1.5_01
OS: Windows Vista (x86) version 6.0
Java: 1.6.0_26, Sun Microsystems Inc.
VM: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
LWJGL: 2.4.2
OpenGL: ATI Mobility Radeon HD 4570         version 2.1.8543 Release, ATI Technologies Inc.

java.io.FileNotFoundException: .\.minecraft\ModLoader.txt (Access is denied)
    at java.io.FileOutputStream.open(Native Method)
    at java.io.FileOutputStream.<init>(Unknown Source)
    at java.io.FileOutputStream.<init>(Unknown Source)
    at java.util.logging.FileHandler.open(Unknown Source)
    at java.util.logging.FileHandler.rotate(Unknown Source)
    at java.util.logging.FileHandler.openFiles(Unknown Source)
    at java.util.logging.FileHandler.<init>(Unknown Source)
    at ModLoader.init(ModLoader.java:804)
    at ModLoader.AddAllRenderers(ModLoader.java:124)
    at sd.<init>(sd.java:58)
    at sd.<clinit>(sd.java:8)
    at net.minecraft.client.Minecraft.a(SourceFile:282)
    at net.minecraft.client.Minecraft.run(SourceFile:658)
    at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 9cb06e0 ----------"

Does anyone know what to do?