Something appears to be hogging all of the machine's CPU and/or using nearly all of its memory.
With no programs running (except for the usual background programs, such as the laptop's anti-virus software), open Task Manager. (Right-click on the taskbar at the foot of the screen to access the option to do so). Click on the Processes tab. Click on the CPU colum header, to place the entries in descending oder of processing power being used, and note down any processes that are placing a heavy load on the CPU. Then click on the 'Memory' tab and look for anything that's using a massive amount of memory.
If anything looks suspicious, report back here to tell us which processes seem to be causing the trouble. (It can often be something like a Windows update, that's refusing to install properly, behind such things. Security software trying, but failing, to updatecan produce similar problems).