$sam=Read-Host "What user account do you want to find?"

[ADSISearcher]$searcher="(&(objectcategory=person)(objectclass=user)(sAMAccountname=$sam))"

$searcher.pagesize=50
$results=$searcher.FindOne()

if ($results.path.length -gt 1)
 {
   write $results.path
 }
else
 {
  Write-Warning "User $sam was not found."
}