Windows Vista Forums

usrclass.dat

  1. #1


    user Guest

    usrclass.dat

    Good afternoon,

    Yesterday, I noticed that my HDD light was flashing about twice a
    second, every second, even while the computer was idle.

    While I got to wondering, I decided to open Vista's Resource Monitor,
    and I looked at the "Disk" section.

    Sitting at the top, when sorted in Write >> ascending, sits Explorer.exe
    writing to c:\users\[uname]\AppData\Local\Microsoft\usrclass.dat.

    In third place sits rundll32.exe, writing to the same file.

    I was just wondering what this file was, and why my computer continues
    to write to the file, and how much damage this constant writing may do
    to my hard drive.

    Thank you,

    U@xxxxxx

      My System SpecsSystem Spec

  2.   


  3. #2


    tazwmg3 Guest

    RE: usrclass.dat

    I had the same thing happen to me a couple of days ago. would love to see an
    answr to this please.

    "user@xxxxxx" wrote:

    > Good afternoon,
    >
    > Yesterday, I noticed that my HDD light was flashing about twice a
    > second, every second, even while the computer was idle.
    >
    > While I got to wondering, I decided to open Vista's Resource Monitor,
    > and I looked at the "Disk" section.
    >
    > Sitting at the top, when sorted in Write >> ascending, sits Explorer.exe
    > writing to c:\users\[uname]\AppData\Local\Microsoft\usrclass.dat.
    >
    > In third place sits rundll32.exe, writing to the same file.
    >
    > I was just wondering what this file was, and why my computer continues
    > to write to the file, and how much damage this constant writing may do
    > to my hard drive.
    >
    > Thank you,
    >
    > U@xxxxxx
    >

      My System SpecsSystem Spec

  4. #3



    Newbie
    Join Date : Jun 2008
    Posts : 2
    Vista Ultimate 32bit
    Local Time: 03:34 PM
    romania

     

    Re: usrclass.dat

    Same problems... even worst... HDD temperature: 58 degrees. I'm running Win Vista Ultimate 32bit, up-2-date. I have also another prb: When I open my browser and I type an URL(I tried Mozilla, IE5, Opera), process explorer.exe crashes, taskbar dissappears, and I have to reopen the explorer manually. From time to time, this message appears:


    and I still receive messages like this one but from different sources like WinAnonimously... :|

    Any option I choose, this URL is opened : hxxp://antimalwareguard.com/2009/10/?rff=http%3A%2F%2Fad.yieldmanager.com%2Fst%3Fad_type%3Diframe%26ad_size%3D180x150%26site%3D140464%26section_code%3D12708330%26cb%3D1214333197848002%26ycg%3Dm%26yyob%3D1988%26pub_redirect_unencoded%3D1%26pub_redirect%3Dhttp%3A%2F%2Fus.ard.yahoo.com%2FSIG%3D14vk09l6s%2FM%3D619213.12708330.13016353.12227498%2FD%3Dmail%2FS%3D398300009%3AREC%2FY%3DYAHOO%2FEXP%3D1214340397%2FL%3DS0i2utG_T4lT5eCxSGFBDAJBUbUieEhhQQ0ADKvV%2FB%3DX_8nQ9j8Yn4-%2FJ%3D1214333197848002%2FA%3D5366722%2FR%3D0%2F%2A&tmn=tmnanmagua&a=nm_ridmm2_ma_kw1&l=yahoo.com&f=nm_156801_563c4322413d11ddb25d156801cfffff_d70f8174f2524dbeb4f8727899fd0261&ax=1&ex=1&ed=2&h=10&mt_info=5723_0_22800:6051_0_20770&rdr=2&tmn=null&mt_info=5723_0_22800:6051_0_20770

    Can someone please help!..
    HDD still write/read in alert mood.. :-s

      My System SpecsSystem Spec

  5. #4


    Hiren Guest

    Re: usrclass.dat

    I have little doubt that your p. c. is infected.If you can use Windows
    Update,update Windows Defender with the latest definitions and run a
    complete system-wide full scan thoroughly.If you cannot,download the Windows
    Malicious Software removal tool from the Microsoft download center from some
    other machine where you can browse properly and run it locally on your
    system.

    "mad_dogu" <guest@xxxxxx-email.com> wrote in message
    news:af10315887b68e4c3e3ec2adc0417e58@xxxxxx-gateway.com...

    Same problems... even worst... HDD temperature: 58 degrees. I'm running
    Win Vista Ultimate 32bit, up-2-date. I have also another prb: When I
    open my browser and I type an URL(I tried Mozilla, IE5, Opera), process
    explorer.exe crashes, taskbar dissappears, and I have to reopen the
    explorer manually. From time to time, this message appears:
    '[image: http://i140.photobucket.com/albums/r...Dogu/pic1.jpg]'
    (http://i140.photobucket.com/albums/r..._Dogu/pic1.jpg)

    and I still receive messages like this one but from different sources
    like WinAnonimously... :|

    Any option I choose, this URL is opened :
    hxxp://antimalwareguard.com/2009/10/?rff=http%3A%2F%2Fad.yieldmanager.com%2Fst%3Fad_type%3Diframe%26ad_size%3D180x150%26site%3D140464%26section_code%3D12708330%26cb%3D1214333197848002%26ycg%3Dm%26yyob%3D1988%26pub_redirect_unencoded%3D1%26pub_redirect%3Dhttp%3A%2F%2Fus.ard.yahoo.com%2FSIG%3D14vk09l6s%2FM%3D619213.12708330.13016353.12227498%2FD%3Dmail%2FS%3D398300009%3AREC%2FY%3DYAHOO%2FEXP%3D1214340397%2FL%3DS0i2utG_T4lT5eCxSGFBDAJBUbUieEhhQQ0ADKvV%2FB%3DX_8nQ9j8Yn4-%2FJ%3D1214333197848002%2FA%3D5366722%2FR%3D0%2F%2A&tmn=tmnanmagua&a=nm_ridmm2_ma_kw1&l=yahoo.com&f=nm_156801_563c4322413d11ddb25d156801cfffff_d70f8174f2524dbeb4f8727899fd0261&ax=1&ex=1&ed=2&h=10&mt_info=5723_0_22800:6051_0_20770&rdr=2&tmn=null&mt_info=5723_0_22800:6051_0_20770

    Can someone please help!..
    HDD still write/read in alert mood.. :-s


    --
    mad_dogu


      My System SpecsSystem Spec

  6. #5



    Newbie
    Join Date : Jun 2008
    Posts : 2
    Vista Ultimate 32bit
    Local Time: 03:34 PM
    romania

     

    Re: usrclass.dat

    Win Defender up-dated made a full system scan and did not find any threats. I've scanned with nod32, lavasoft ad-ware pro 2008, and both of them found that in C:\users\username\appdata\local\temp were some .dll files that cannot be deleted. And they start at win start-up. However, both progs found that this files were trojans :| I figured out somehow and I deleted them, and now my HDD is in normal state. I think it was a prb with those files.. i don`t know exactly. But still my explorer.exe process is killed from time to time when I surf the web.

      My System SpecsSystem Spec


usrclass.dat