What I usually do is I go to
msconfig and disable all startup programs, and all non-Microsoft services. But, I've heard an opinion that hardware manufacturers install additional software with the reason to avoid crashes and unstable work.
I do not know whether I should or can disable programs like:
Synaptics pointing device, Realtek HD Audio Manager, Intel Common User Interface, Dell Quickset, IAStorIcon, Adobe Acrobat, Microsoft Office 2010, etc.
Why does, for example, MS Office wants to start on computer load?
Is it safe to disable all applications?
Is it going to improve my performance?