First off, let's deal with a common misconception in order to save you grief -- as bloatware does NOT, repeat NOT, slow down your PC. While HP does install a bunch of utilities, they take up very little space and use very little processor power. So removing them would not speed up your PC and risks corrupting it.
Second, in terms of speeding up your PC, there are two different situations. The first is boot time -- and that is a direct result of how much stuff you have loaded at startup. The more you disable, the faster the boot time. The second is the hard drive. If the PC is really, really SLOW, that is an indicator of a failing drive -- which you then need to check.
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