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Windows 7: Can't Download after Install a Registry

10 Dec 2012   #1

Windows 7 Ultimate 32bit
Can't Download after Install a Registry

My brother just install a Registry and now i Can't Download anything(but i still can browsing) Please tell me what is the problem, and give me the solution.
This is the registry script
[HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesT cpipParameters]
“SackOpts” = dword: 00000001
“TcpWindowSize” = dword: 0005ae4c
“Tcp1323Opts” = dword: 00000003
“DefaultTTL” = dword: 00000040
“EnablePMTUBHDetect” = dword: 00000000
“EnablePMTUDiscovery” = dword: 00000001
“GlobalMaxTcpWindowSize” = dword: 0005ae4c

My System SpecsSystem Spec
10 Dec 2012   #2

Microsoft Community Contributor Award Recipient


Hello reyzafany and welcome to Seven Forums.

The problem is your brother. The solution is to hit him up side his head with a 2x4 to get his attention and then explain to him if he ever touches your computer again you'll really hurt him.

Have your brother undo the changes he made.

If that doesn't work try using System Restore to roll back the computer to a date/time prior to when your brother made the registry changes.

System Restore
My System SpecsSystem Spec
10 Dec 2012   #3

Windows 7 Ultimate 32bit

The problem is he deleted my system restore to save more HDD space without telling me and know i don't know what i must do....
My System SpecsSystem Spec

10 Dec 2012   #4

Microsoft Community Contributor Award Recipient


The best solution is to have your brother undo the changes he made. Only he would know if he changed anything else in the registry. If he can't (or won't) undo the changes, hit him a few more times with that 2x4.

I have two possible things you can try but absolutely no guarantee either one will work. Before trying either one make a new restore point (or better yet, a system image) just in case things get worse.

First possibility: Last Known Good Configuration. LKGC has backups of the registry hives. But if you've rebooted the computer since your brother made the registry changes, then those registry backups will have also changed. But if you want to try it, you need to access Advanced Boot Options menu.

Advanced Boot Options

Second possibility: A repair install. This will try to fix your currently installed Windows 7 by using default configurations while preserving your user accounts, data, programs, system drivers, etc. You will need a Windows 7 installation disk that is the same edition of Windows 7 that you have installed.

Repair Install

Perhaps some other Forum members will jump in with better solutions.
My System SpecsSystem Spec
10 Dec 2012   #5

Microsoft Community Contributor Award Recipient

Windows 8.1 Pro x64

Hello reyzafany and welcome to the forums

I second marsmimar's solution with the 2x4! That registry script couldn't be any more wrong if I tried to make a bad one! Firstly, Vista and Windows 7 use a Windows Registry Editor Version 5.00 and XP uses REGEDIT4 - so first of all he's used the wrong header. Secondly, the key name is completely wrong.

He has used: [HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesT cpipParameters]
When it should be: [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters]

He has also used the wrong syntax for defining the values. It should be:


He's put spaces in there when they really shouldn't be.

I highly doubt you'll see any noticeable speed improvements with this registry change, so let's just remove them:

Backing Up Your Registry

  1. The steps that I am about to suggest involve modifying the registry. Modifying the registry can be dangerous so we will make a backup of the registry first.
    Modification of the registry can be EXTREMELY dangerous if you do not know exactly what you are doing so follow the steps that are listed below EXACTLY. if you cannot perform some of these steps or if you have ANY questions please ask BEFORE proceeding.
  2. Download ERUNT
    (ERUNT (Emergency Recovery Utility NT) is a free program that allows you to keep a complete backup of your registry and restore it when needed.)
  3. Install ERUNT by following the prompts
    (use the default install settings but say no to the portion that asks you to add ERUNT to the start-up folder, if you like you can enable this option later)
  4. Start ERUNT
    (either by double clicking on the desktop icon or choosing to start the program at the end of the setup)
  5. Choose a location for the backup
    (the default location is C:\WINDOWS\ERDNT which is acceptable).
  6. Make sure that at least the first two check boxes are ticked
  7. Press OK
  8. Press YES to create the folder.

Registry Modifications

  1. Go to Start > Run to bring up the run box
  2. In the box, type notepad.exe and press OK to open Notepad
  3. Copy (Ctrl+C) all of the text in the following box and paste (Ctrl+V) it into Notepad

    Windows Registry Editor Version 5.00
  4. Go to File > Save As... and save it to your Desktop named Fix.reg. Make sure you change the Save as type to All Files (*.*)
  5. Locate Fix.reg on your Desktop and double-click on it to merge it with your registry
  6. Answer Yes when prompted about merging with the registry

My System SpecsSystem Spec
10 Dec 2012   #6

Windows 7 Ultimate 32bit

Thanks tom982 now i can download again,but when i want download from IDM it always show this eror, any solution?

My System SpecsSystem Spec
10 Dec 2012   #7

Microsoft Community Contributor Award Recipient

Windows 8.1 Pro x64

Uninstall it whilst we troubleshoot :)

Uninstall Software

  1. Click on the Start button and select Control Panel
  2. Click on Programs then click on Uninstall a program
  3. You will now see a list of your installed software, double click on the following one by one to uninstall them:

    • Internet Download Manager
  4. Once you have done this, reboot your computer

My System SpecsSystem Spec
08 Apr 2014   #8

Windows 7 Ultimate 64bit

Just for the records:
It seems that UPC Switzerland (largest cable provider in Switzerland) provide such registry tweaking infos.
Unfortunately they say nothing about the target OS version:
My System SpecsSystem Spec
08 Apr 2014   #9

Microsoft Community Contributor Award Recipient

Windows 8.1 Pro x64

Thanks DevIconChanger, I'll give it a test when I'm next home and post the results here :)
My System SpecsSystem Spec

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