Hi!! I think I can help you with the new pc!

Go to confuguration screen.
Click on Screen options.
Click on Screen protection: there you can tell your pc how long he may wait to go into sleep mode. I usually ask 10 minutes. And I select a range of pics to be shown as screen protection!
Good luck! Hope this helped you!!

Your old pc:
I am not sure what pc you had. But try this:
Go to confuguration screen again.
Choose a category: - printers
- mouse
-software
- etc....
Click on what you want, and then delete it.
If it is a program, then you must go to Software, and then go to the program you want to delete, then delete

Okay? GOOD LUCK