BitTorrent does not take a lot of memory, again does not need to startup when PC does. Yes, most browser use a substantial amount of memory when running (not GB), Chrome is probably one of the most out of most browsers, Mozilla Firefox being another.
Sometimes disk activity at beginning when you first boot can be common, it can also be your Anti-Virus checking for updates or scanning, check your Anti-Virus scheduling. As long as it does not stay like this too long after boot.
When you first posted here your issues was a slow bootup, system shutting down. We felt it was overheating because of shutdowns. We checked the hard drive because we thought this was an issue to, your chkdsk shows good.Seems shutdown issues stopped.
There are Hard Drive diagnostic programs to check the drives health, read and write benchmarks, but i don't think now this is the reasons for a slow PC at start anymore.
http://www.hdtune.com/ feel want to check the HDD further can use this trial software, least check the S.M.A.R.T status
As said in beginning of this post was startup items and running services will usually cause slow boot. Sometimes the best way to check this is through the programs themselves. Look in options of programs you have to try to disable features and disable startup of program. Do you have any defragmenting programs that run automatically, this can make high disk usage if set to run on boot ?
Certain software and there drivers may need to run at start and stay running for proper operation. Do not want to just go shutting everything off, will find then an issues with one you did that needed to run.
You are in front of this PC, you know what programs you have and check how they are set. As said check there options. Things load into RAM from begining of startup.
Edited by CompCav, 16 April 2015 - 06:32 PM.