Hi i am using SolarWinds NPM trail version. I want to monitor cpu and memory usage for my windows server. can someone guide me on how to set it trigger alerts
Presumably you have added the server to monitoring (via Agent or SNMP)?
And presumably you have you 'List Resources' against the server and enabled the CPU & Memory monitor?
Once you've done this, the next step would be creating the alert - for that see this: https://solarwindscore.my.site.com/SuccessCenter/s/article/How-to-create-a-High-CPU-Utilization-Alert-in-NPM?language=en_US