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Thread: Rundll32.exe not found and more problems in Vista

  1. #1
    festiva is offline New Member
    Join Date
    Mar 2010

    Unhappy Rundll32.exe not found and more problems in Vista

    I'm new to this forum (or any in particular) so i don't really know how this works, but I really need some help.

    I also know pretty much nothing about computers, so I extra need some help.

    I have windows vista and my comp has been bugging out in a multitude of ways.
    Randomly one day, whenever I tried to click on any of my applications, it would either ask me what program I wanted to open it with (even if the application didn't work that way, like mozilla)
    or would say that the application wasn't found.

    ex. "C:\\Windows\system32\rundll32.ese Application not found" when i try to open my security center

    [it used to say that there was a problem with the rundll32.exe at startup a couple months ago, but then it just stopped]

    I can't even open anything in my control panel!
    edit: also, to get any program to even run, i have to run it as an administrator (this doesn't work for all programs)

    Please help me out if anyone knows what's going on! It'd be very much appreciated.
    Last edited by festiva; 31st March 2010 at 18:49.

  2. #2
    HappyAndyK's Avatar
    HappyAndyK is offline Site Administrator
    Join Date
    Jun 2008


    Did you try to do a system restore to a prior (oldest available) good point? It may help!

    I presume you mean rundll32.exe and not rundll32.ese. Nevertheless scan your PC for malware and use Disk Clean utility to clear PC junk.

    If a known program asks you to select which program to use to open ... your file associations may have got messed up. Pls see this and this.

    Run the System File Checker in Windows 7 or Vista, type cmd in start search box. In the result, which appear, right click on cmd and select Run As Administrator. In the command prompt window which opens, type sfc /scannow and hit Enter.

    Also see if Windows Host Process Rundll32 has Stopped Working helps you.

  3. #3
    rkonit's Avatar
    rkonit is offline Gold Member
    Join Date
    Jul 2008
    Pilani, India


    Open Notepad and Copy n Paste following Registry Code, then save with .REG extension.

    Windows Registry Editor Version 5.00

    [-HKEY_CURRENT_USER\Software\Microsoft\Windows\Curre ntVersion\Explorer\FileExts\.exe\UserChoice]

    "Content Type"="application/x-msdownload"


    "FriendlyTypeName"=hex(2):40,00,25,00,53,00,79,00, 73,00,74,00,65,00,6d,00,52,\
    00,6f,00,6f,00,74,00,25,00,5c,00,53,00,79,00,73,00 ,74,00,65,00,6d,00,33,00,\
    32,00,5c,00,73,00,68,00,65,00,6c,00,6c,00,33,00,32 ,00,2e,00,64,00,6c,00,6c,\




    @="\"%1\" %*"
    "IsolatedCommand"="\"%1\" %*"


    @="\"%1\" %*"
    "IsolatedCommand"="\"%1\" %*"


    And after saving the file...just double click on patch the reg code.

    You may need to restart or logoff your PC to take effect.

  4. #4
    festiva is offline New Member
    Join Date
    Mar 2010


    sorry, i'd meant to reply sooner but wasn't able to log on for some reason

    the day after I wrote this, my computer suddenly started working again! i have no idea why and am afraid to question my luck lol

    but thank you so much to both of you! if the problem ever happens again, I'll be sure to follow your advice!

    thanks again for taking the time and effort to offer help!

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