I have noticed my new HP Pavilion TX 1000 gets scorching hot when it is plugged in and running on the "High Performance" power plan.

Changing the Minimum processor state value to '5%' (from 100%) under the High Performance power plan allows the CPU to rest when high demand is not necessary thus allowing your laptop to run cooler.

This value can be updated under:

Control Panel > Power Options > High Performance Power Plan > Change Plan Settings > Change Advanced Power properties > Processor Power Management > Minimum Process state > Plugged in: