Replace Windows Defender full scan with quick scan

Author: AgenttiX

Maintenance.ps1

@@ -640,8 +640,10 @@ if (Test-CommandExists "Update-MpSignature") {
     Show-Output -ForegroundColor Red "Virus definition updates are not supported. Check them manually."
 }
 if (Test-CommandExists "Start-MpScan") {
-    Show-Output -ForegroundColor Cyan "Running Windows Defender full scan. If you have another antivirus program installed, Windows Defender may be disabled, causing this to fail."
-    Start-MpScan -ScanType "FullScan"
+    # A full scan can take hours, during which the computer may be unusably slow.
+    # Therefore, a quick scan is used instead.
+    Show-Output -ForegroundColor Cyan "Running Windows Defender quick scan. If you have another antivirus program installed, Windows Defender may be disabled, causing this to fail."
+    Start-MpScan -ScanType "QuickScan"
 } else {
     Show-Output -ForegroundColor Red "Virus scan is not supported. Run it manually."
 }