Vb.Net - querying event log (system) entries

Hi - I'm trying to pull information related to hotfix installations on my devices.
I'm using vb.net 2005 to read the remote logs, but am not finding an easy way to filter it properly, and it's taking to long to iterate the entire log collection and pull back just what I need...

I ordinarily only need log entries for 'today' that have a source of NtServicePack (eid 4377 seems to be the eventid, but I do get a warning in my code to use instanceID which isn't showing the same value).

I simply want to pull back if the hotfix was properly applied or not...
Any ideas on how I can further narrow this, or somehow speed up my query?

(If it helps - I could also filter by username, because normally only one user would be doing the installation)

Using elEvent As New EventLog("System", strComputer, "NtServicePack")
  Dim elEvtCol As EventLogEntryCollection = elEvent.Entries
            For x As Int32 = elEvtCol.Count - 1 To minRecordsToReturn Step -1

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