What is the correct syntax for this If statement?

Perhaps elseif would work better on your second condition

if (($OS.Version -eq "5.1.2600") -OR ()) {
write-host "OS Version: Windows XP"
.\PromptReset.ps1
}
[b]elseif[/b]
{
write-host "OS Version: Windows 2003"
.\PromptReset.ps1
}
}

#Unknown OS

else {write-host "The OS for: $strComputer is unknown"}

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Beyond that, a switch may work better.  I usually use switches once I get past 2 conditions, but, 3 is not far past 2.

I think you've got half a script there.  If I re-organise your code with my indenting conventions I get this:

	if(get-PSSnapin Quest.ActiveRoles.ADManagement) {
		write-host Quest Tools are installed
	} else {
		Write-Host "No Quest Tools are installed"
	}
	
	Add-PSSnapin Quest.ActiveRoles.ADManagement
	Write-Host "Quest Active Roles for Active Directory is now installed on your system." 
	
	$strComputer = Read-Host "Enter Computer Name"
	$OS = gwmi win32_OperatingSystem -Comp $strComputer
	
	# if statement to run code for Windows XP and Windows 2003 Server.
	write-host "Computer Name: " $strComputer
	if ($OS.Version -eq "5.1.2600") {
		write-host "OS Version: Windows XP"
		.\PromptReset.ps1
	} else {
		write-host "OS Version: Windows 2003"
		.\PromptReset.ps1
	}
} else {
	write-host "The OS for: $strComputer is unknown"
}

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As you can see, you've got the last half of an if..else block there - The 'if ([condition]) {' part is missing.  I'm guessing that you've errors supressed so PS skips over the stuff it can't make sense of, because the initial part is 'missing' and merrily executes the line it can understand.

RussPitcher

I got an unexpected token on line 22.