Try typing 'reliability' in your search box, get into Reliability History and look at the detail for any 'red x' entries.
https://lifehacker.com/how-to-troubleshoot-windows-10-with-reliability-monitor-1745624446
https://www.makeuseof.com/tag/windows-7-reliability-monitor/Thank you for the quick reply, the only problem is am using Windows 7 Ultimate SP1