How do i speed up my Windows 7 HP Netbook?

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I have a windows 7 HP Netbook. And i think it has maybe 2 or 4 GB of ram.... The computer is very slow doing two things at once. I can barely stream videos without it playing slow. I removed most of the items from the computer start up list... but it changed the way Windowws looked and i couldnt start the HP Wifi start up. I need to know if they is any way i clear clear up the ram. I DELETE ITEMS FROM THE TASK MANAGER PROCESS BUT THEY SEEM TO START UP. Im going to delete google chrome because it always runs in the background sort of like spyware. i really just want to delete all the start up program that make the computer slow down . Please help me!