Get-Content c:computers.txt | `
   Select-Object @{Name='ComputerName';Expression={$_}},@{Name='FolderExist';Expression={ Test-Path "\$_c$program files (x86)thefolder"}}

Get-Content .computers.txt |
   Select-Object @{Name='ComputerName';Expression={$_}},
     @{Name='Online';Expression={(Test-Connection $_ -count 1 -EA 0).StatusCode -eq 0}},
     @{Name='FolderExist';Expression={ Test-Path "\$_c`$program files (x86)common files"}}

ComputerName Online FolderExist
------------ ------ -----------
Computer01     True        True
Computer02    False       False
Computer03     True       False

Get-Content .computers.txt |
       Select-Object @{n='ComputerName';e={$_}},
                     @{n='FolderExist';e={ If(Test-Connection $_ -Quiet -Count1){Test-Path "\$_c`$program files (x86)common files"}else{"Offline"}}}