Computer goes very slow even after reformatting


  1. Posts : 10
    Windows 7 Home Premium 64bit
       #1

    Computer goes very slow even after reformatting


    Hello.

    I will try to make this story as short as possible, but I am very frustrated on this.

    My dad's laptop had gotten a bunch of viruses/rootkits, so I decided to use KillDisk and erase everything with one pass.

    Everything gets done and I reinstall Win 7 Home Premium 64bit. Install everything and use the laptop like normal.

    For the first five minutes, everything is fine. Loads programs up in a couple of settings.

    After the five minutes, it starts getting very slow. The mouse is lagging. Everything takes a couple of minutes to load. The only thing I even did besides have it on was install Windows Update when you first reformat.

    After a few more KillDisks and reformatting. the same problem is happening. I know rootkits are harder to kill than most, but can it be possible it is STILL alive?

    I also am thinking maybe something inside the laptop is wrong (CPU, HDD.) How would I be able to check this to let you guys know?

    I will try the HP Recovery Manager in a while and see if there is any difference.

    Please, if anyone could help me and give me at least some ideas to why this is happening.

    Thank you.
      My Computer

  2.    #2

    It's unlikely the virus could survive a simple format or just the Diskpart Clean Command
    which wipes the boot sector, although some can get into the BIOS.

    First I would concentrate on getting a perfect reinstall: Clean Reinstall - Factory OEM Windows 7 - Windows 7 Forums

    Then if necessary compare that with Factory Recover if you made the DIsks or saved the Recovery partition: HP Recover Windows 7 Operating System Using HP Recovery - HP Customer Care (United States - English)

    If problems persist test your hardware and work through these other troubleshooting steps
      My Computer


  3. Posts : 1
    Windows 7 Home Premium 64bit
       #3

    Dust in the fans and heat sink could cause this. (heat may cause CPU to 'throttle') You can try a can-of-air, if that helps you know you need to get it cleaned.

    A Laptop, depending on when and where you uses it, can require cleaning annually.
    Last edited by opraus; 21 Mar 2012 at 04:07. Reason: more info
      My Computer


  4. Posts : 1,167
    Windows 7 Pro with SP1 32bit
       #4

    Please delete all the partitions of the Hard Disk before doing the next clean install of Windows 7. This shall make sure that every trace of the viruses and root-kits is gone.
      My Computer


  5. Posts : 133
    windows 7 x64 pro sp1
       #5

    get more ram as well. running 2 gigs with windows 64 will slow it down
      My Computer


  6. Posts : 644
    Windows 7 home premium x64
       #6

    I'm with Gregrocker, there have been quite a few rapidly spread rootkits lately, many of which also infect the BIOS, try running a dedicated rootkit killer. Your AV should have one , I have used |MG| Kaspersky TDSSKiller 2.7.20.0 Download

    with reasonable success.
      My Computer


 

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