Hello, I got a mistake

I have some problems with java latest version installation from java.com
First of all I delete all old java versions, how it is described on java instalation tips.
But now when the installation process is finished I got an error (the translation from my language):

Java(TM) Platform SE binary -Security Alert
There are some problems with this file
Name: jre1.6.0_27-c-l.msi
Publisher: unknown publisher
___
This file was blocked because it doesn't have valid digital signature, confirming its publisher

Whats wrong?
Please help me guys.

Im so sorry if this forum is not right place for my thread and my problem.
I lost any hopes to install java on my PC, please don't angry on me :(

Windows Vista?

db

Windows 7 core i5

anybody? ...

PLEASE, help me.
I cnt watch videos, I cant play games, I cant do anything without java.
Anybody??

you may do system restore

I had the same problem.
When you download the installer go to the directory, right click the installer exe and
run as administrator. it should install.