Hi, yes i agree your first approach should have been to contact the seller, not too late, I would do this now.
If you decide not to and wish to proceed then the systeminfo from Mac's link is a bit too lean for your problem.
press the win + x keys, select Powershell (admin) from the options, an elevated powershell prompt will open, copy the below cmd and right click anywhere in the powershell window, the cmd will append to the prompt, press enter.
Get-Process | Sort CPU -descending | Select -first 8 -Property ID,ProcessName,CPU | format-table |out-file $home\cpu.txt
notepad $home\cpu.txt
Notepad will open do this when your machine is at 100% it gives us the top 8 running processes. Please copy paste this notepad output here.
Next still in the powershell window type:-
cmd (press enter)
This opens a cmd prompt within powershell, copy ALL the below cmd, and right click anywhere in the cmd\powershell window,the cmd will append to the prompt, press enter.
echo > 0 & systeminfo >> 0 & WMIC /Node:localhost /Namespace:\\root\SecurityCenter2 Path AntiVirusProduct Get displayName /format:list >> 0 & wmic PATH Win32_VideoController GET Description,PNPDeviceID /format:list >> 0 & wmic logicaldisk where drivetype=3 get Name, Compressed, Description, FreeSpace /format:list >> 0 & tasklist /v >> 0 & net start >> 0 & echo >> 0 & notepad 0
Notepad will open with a lot of data please save this to desktop and use the "more Options" link at the bottom of the thread to attach the file in your response. This gives us far more info then Mac's link and also does not need you to download anything.