if i disable comodo AV can i install and use avast or something else because i dont feel like reinstalling
Yes you can, but definition updates for Comodo AV would still download.
May be this is of help here:
Not easily.
If you go to the AV scanner settings, you can uncheck Automatically update virus database before scanning under the Real Time Scanning settings. This is the setting that tells it to update every 30 minutes.
Leave Automatically update checked in the Manual and Scheduled Scanning settings.
Now you can either leave it alone and it will update before running your weekly (or whenever) scan or if you do a right-click scan of a file.
If you want the database to update more frequently, say daily. You can set up a dummy scan profile. Create a profile that only scans a .txt file or something small so the scan is more or less instant. Then create a scheduled scan to run this profile when you want the database update to happen.