$server = 127.0.0.1
$starttime = get-date -Format yyyy-MM-dd 

Get-EventLog Application -ComputerName $server -After $starttime | 
    ? { $_.entryType -Match "Error" -and "Critical" } |
    Group-Object -Property EventID |
    % { $_.Group[0] | Add-Member -PassThru -NotePropertyName Count -NotePropertyValue $_.Count } |
    Sort-Object EventID -Unique | 
    Select-Object Count, TimeGenerated, EventID, Source, Message | 
    ft -AutoSize -Wrap | 
    Out-File $file -Append