Win 7 boots slowly - continue finding root cause - problem never stops

ntd252

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Hi everyone!
I'm the person who has a thread about the problem of slow booting in Windows 7 and the problem seemed closed about two weeks ago. I was glad to say that I had found the problem to cause it after trying a lot of solutions from members in the forum: it was registry cleanup tool. However now, I am get into this trouble again. :(

So I am willing to open this problem again to try everything as much as possible to find a true root cause that makes my OS like this.

If you follow me in the old thread Windows 7 boots slowly with black screen after "Welcome" , you will know that I have three OS in my computer. One is Win that I use for my main tasks, one is another Win 7 that I use to find the reason to cause slow boot on the first win 7, the rest is win 10.

After deciding the registry cleanup tool causes the problem, I re-installed my first windows 7 (I still call it first win 7). This time, I avoiding using registry cleanup tool on Ccleaner. Things I do: Install drivers from manufacture, update OS, install software like Office, Chrome, AV (Avast). That's it.
My system is so smooth and boot quite fast, but after installing Avast (I installed it after other softwares), the OS gets into slow boot again, so annoyed, right after the first reboot. I'm thinking that Avast is another reason causes that, but the crazy thing is Avast on the second Win 7 doesn't. Second Win 7 still boots fast and smoothly.

Here, the biggest difference between them is one is updated, one isn't. Unfortunately, the slow boot happens only after installing avast, not after installing windows updates.

To make it clearly for you, I capture the bootings.
In the video, you will see the booting of the two Win7s.
Something different between these two.
First Win 7 (have slow booting), is up-to-date (all OS and Office software). It has system reserved partition (when I re-installed, I deleted its partition and created again).
Second Win 7, hasn't been updated yet, some softwares are installed on this OS. The number of start-up items is more than the first win7's
Both OSes have the same drivers from manufacture, both are defragged.

race - YouTube


Ignore those solutions: remove startup programs, update system.
I'm planning to use Windows Performance kit to trace the booting like this artile:Trace Windows 7 boot/shutdown/hibernate/standby/resume issues - Windows 7 - MSFN

But at first, I would like to hear your suggestions. I hope that you're ready to help me get out of this! Thanks!:confused:
 

My Computer

Computer type
PC/Desktop
OS
Windows 7 home premium 32 bit
Run sfc /scannow
Schedule a disk check chkdsk c: /f
- As Avast was the last to be installed, I would uninstall it.
Reboot
- Disable win updates on services
Reboot
 

My Computers

System One System Two

  • Computer type
    PC/Desktop
    Computer Manufacturer/Model Number
    custom build
    OS
    Windows 7 HP 64
    CPU
    i5 6600K - 800MHz to 4200MHz
    Motherboard
    GA-Z170-HD3P
    Memory
    4+4G GSkill DDR4 3000
    Graphics Card(s)
    IG - Intel 530
    Monitor(s) Displays
    Samsung 226BW
    Screen Resolution
    1680x1050
    Hard Drives
    (1) -1 SM951 – 128GB M.2 AHCI PCIe SSD drive for Windows 7 and Lubuntu
    (2) -1 WD SATA 3 - 1T for Data
    (3) -1 WD SATA 3 - 1T for backup
    PSU
    Thermaltake 450W TR2 gold
    Keyboard
    Old and good Chicony mechanical keyboard
    Mouse
    Logitech mX performance - 9 buttons (had to disable some)
    Internet Speed
    500Mb/s
    Browser
    Firefox 64
    Other Info
    TinyWall firewall
  • Computer type
    Laptop
    System Manufacturer/Model Number
    Asus Q550LF
    OS
    Windows 7 Pro
    CPU
    i7-4500U 800MHz to 3.0GHz
    Motherboard
    Asus Q550LF
    Memory
    (4+4)G DDR3 1600
    Graphics Card(s)
    IG intel 4400 + NVIDIA GeForce GT 745M
    Sound Card
    Realtek
    Monitor(s) Displays
    LG Display LP156WF4-SPH1
    Screen Resolution
    1920 x 1080
    Hard Drives
    BX500 120G SSD for Windows and programs +
    1T HDD for data
    Internet Speed
    500 Mb/s
    Browser
    Firefox
    Other Info
    TinyWall firewall
Run sfc /scannow
Schedule a disk check chkdsk c: /f
- As Avast was the last to be installed, I would uninstall it.
Reboot
- Disable win updates on services
Reboot

Thanks! I have already run sfc, no violation
Avast might be thought to cause it, but the reason makes me keep it is the second win 7 with Avast has no problem. So I'm trying another solution to keep Avast but fix it. Uninstalling it is the final key.
Windows updates is already disabled on both Win7.
Hope to see another advice from you! ::)
 

My Computer

Computer type
PC/Desktop
OS
Windows 7 home premium 32 bit
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