What's your date of Windows 7 installation?

Not at my personal desktop but it would be the date I built the system as it would be on every computer I've ever made for myself. I've never had to reformat and reinstall windows on any machine for any reason as long as it was an actively used machine which can last anywhere from 3-5 years or so. Then they move over to being a secondary/guest/experimental machine for another few years.

My secondary machines get all kinds of experimental things installed on them and don't really count (i.e. curently is my win8 test machine), but my main machines have never needed to be reformatted "just because"

Now if you want to see the date in a normal format and to see much more about your operating system then:

Script:

# ************************************************************
# Puts OSInfo.txt on your desktop.
# OSinfo contains information about your operating system
# **********************INSTRUCTIONS**************************
# STEP 1 *****************************************************
# RUN PowerShell as administrator
# START ORB | type POWERSHELL | CTRL+SHIFT+ENTER key combo | ALT+Y keycombo
# ************************************************************
# STEP 2 *****************************************************
# COPY, using CTRL+C, every line down thru both EXIT statements 
# PASTE into Powershell == Right-Click at the PowerShell Prompt
#  (Ctrl+V does not work)
# Start copying with first line without a # at start of the line
# Note: Actually, you can paste the entire file if you rather
#       Lines starting with a # are ignored by PowerShell
# ************************************************************

function get-ID { 
  param ([string]$title, [int]$arraycnt, [int]$arrayndx) 
  $id = " " + $title + " "
  If ($arraycnt -eq 1) {} else {$id = $id + [string]$arrayndx + " "}
  $id } 
function get-title { param ([string]$id) 
  $hashes = ([int](44 - $id.length)/2)
  For ($j=0; $j -lt $hashes; $j++){$hashstr += "#"  }
  $title = $hashstr + $id + $hashstr
  If ($title.length -le 44) {$title += "#"}
  $title }
$obj = New-Object PSObject
$os = gwmi win32_operatingsystem
$id = get-id "OS" 1 0
$obj | Add-member -membertype noteproperty -name (Get-Title $id ) -value $sterne
$installdate = $os.converttodatetime($os.installdate)
$obj | Add-Member -MemberType NoteProperty -Name ($id + "Install Date") -Value ($installdate)
$obj | Add-Member -MemberType NoteProperty -Name ($id + "Install Duration (days)") -Value ((new-timespan $installdate).days)
$obj | Add-Member -MemberType NoteProperty -Name ($id + "Last Bootup Time") -Value ($os.converttodatetime($os.lastbootuptime))
$obj | Add-Member -MemberType NoteProperty -Name ($id + "Local Date Time") -Value ($os.converttodatetime($os.localdatetime))
$obj | Add-Member -MemberType NoteProperty -Name ($id + "Status") -Value ($os.status)
$obj | Add-Member -MemberType NoteProperty -Name ($id + "Computer Name") -Value ($os.csname)
$obj | Add-Member -MemberType NoteProperty -Name ($id + "Registered User") -Value ($os.registereduser)
$obj | Add-Member -MemberType NoteProperty -Name ($id + "Number of Licensed Users") -Value ($os.numberoflicensedusers)
$obj | Add-Member -MemberType NoteProperty -Name ($id + "Number of Users") -Value ($os.numberofusers)
$obj | Add-Member -MemberType NoteProperty -Name ($id + "Architecture") -Value ($os.osarchitecture)
$obj | Add-Member -MemberType NoteProperty -Name ($id + "Version Number") -Value ($os.version)
$obj | Add-Member -MemberType NoteProperty -Name ($id + "Name, Drive\Partition") -Value ($os.name)
$obj | Add-Member -MemberType NoteProperty -Name ($id + "Version") -Value ($os.caption)
$obj | Add-Member -MemberType NoteProperty -Name ($id + "Service Pack") -Value ($os.csdversion)
$obj | Add-Member -MemberType NoteProperty -Name ($id + "Windows Directory") -Value ($os.WindowsDirectory)
$obj | Add-Member -MemberType NoteProperty -Name ($id + "System Directory") -Value ($os.systemdirectory)

$obj > $env:userprofile\desktop\OSInfo.txt

EXIT
EXIT

# ***************** NOTE - POWERSHELL VERSION*****************
# if you receive this error msg:
#  Get-WinEvent: The system can not find the path specified
# you need to update your PowerShell
# you must be using Powershell 2.0 or later.
#
# To determine your Powershell version:
#   Run PowerShell
#   enter $host.version
#   you should see at least:
# Major  Minor  Build  Revision
# -----  -----  -----  --------
# 2      0      -1     -1
#
# If you do not see the above, update your Vista/Win 7.
# ************************************************************
# *************** NOTE - EXECUTION POLICY*********************
# If you haven't set the execution policy, you may need to:
#   Run PowerShell
#   enter Set-ExecutionPolicy -executionpolicy remotesigned
#
# ************************************************************ 


karlsnooks said:

Yes. Should have worked.
Although you might have needed to actually use full name with extension

Most of us don't run from within \windows\System32.

go to a command prompt, carry out following one-liner:
wmic os get /all /format:list > %userprofile%\desktop\osinfo.txt

will put install date and much more in osinfo.txt on your laptop.

You will notice that the date/time format is a little unusual.

Thanks for the above but it didn't work, just kept coming back to the command prompt. I carefully copied and pasted the line into Wordpad first to make sure I got spaces where they should be. I Typed this:
wmic[space]os[space]get[space]/all[space]/format:list[space]>[space]%userprofile%[space]\desktop\osinfo.txt
Earlier I had downloaded SystemInfo.exe form Brinks tutorial on the subject so that provided all the info I needed.
Thanks you anyway.

run as administrator.

That wmic command never fails!

wmic[space]os[space]get[space]/all[space]/format:list[space]>[space]%userprofile%[space]\desktop\osinfo.txt

that space is wrong. Always easiest to simply copy with Ctrl + C and then paste into the command shell using:
RIGHT-CLICK

same technique works in PowerShell.

karlsnooks said:

run as administrator.

That wmic command never fails!

wmic[space]os[space]get[space]/all[space]/format:list[space]>[space]%userprofile%[space]\desktop\osinfo.txt

that space is wrong. Always easiest to simply copy with Ctrl + C and then paste into the command shell using:
RIGHT-CLICK

same technique works in PowerShell.

Copies and pasted the line in command prompt run a admin and get this:

August of 2009.
Been through 3 mobo/CPU swaps and no issues.

30th June 2012 :)

Clean install on my new SSD

As long as my system is running OK, I don't bother when I first install it. The moment my system starts behaving funny, I will either restore, or reinstall everything, dependent on whether I have a restore partition or not.

On my present laptop, which I got last july, I restored it on this 1st of july as I was getting some problems with some software.

Funnily the original install did not get validated by Microsoft, but after restored with restore partition, it got validated.