Get the last formatted dates of all machines in the network.

If you are able to run scripts remotely then you can run a script.

have a look into windows scripting: http://www.microsoft.com/technet/scriptcenter/scrptfaq.mspx

This will give you access to the disk object model to find out all the resouces you need

I don't think this is possible (as far i know). However you can get date and time of Windows installation.

Thats what i want.Windows installation = Windows formatted date...

you can use this in a batch file

c:\>systeminfo | find /i "install date."

This command reads some thing but gets no output.How can i scan all machines in a file and get results to a file.

you could then loop through a file of computers and use the psexec from sysinternals to execute this.

In your batch file you would also use the >> operator to redirect all output to a file

ie.

psexec [other switches etc] systeminfo | find /i "install date" >> output.txt