The installation process stops responding, or you receive an error message when you try to install the .NET Framework 2.0, the .NET Framework 1.1, or the .NET Framework 1.0

To resolve this problem, follow these steps:

1. Open your browser to Microsoft Security Essentials. To do this, visit the following Microsoft Web site:
   http://onecare.live.com/site/en-us/default.htm
2. Click Full Service Scan, read the service agreement, and then click Accept. You must accept the terms of the service agreement to continue.
3. On the Install the scanner page, click Install Now. Click Install in the dialog box that appears.
4. As soon as the installation is complete, click Launch Scanner.
   
5. Select the Complete scan (recommended) option, and then click Next.
   
   
6. When the scan is complete, try to install the .NET Framework.

If you still cannot install the .NET Framework, follow these steps:

1. Open the %WinDir%\System32 folder. To do this, click Start, click Run, type %windir%\system32, and then click OK.
2. Try to locate one of the following files:
   • Avload32.dll
   • Logon16x.dll
   • Yvsvga.dll
   • Lanh64.sys
3. If you see one of the files that is listed in step 2, right-click the file, and then click Delete.

If you cannot delete the file, you will have to restart the computer in safe mode. To do this, follow these steps:

1. Click Start, click Run, type msconfig, and then click OK.
   
2. Click the BOOT.INI tab, click to select the /SAFEBOOT check box, and then click OK.
   
3. In the System Configuration dialog box, click Restart.
   
4. In safe mode, open the %WinDir%\System32 folder, right-click the file that you want to delete, and then click Delete.

If you still cannot delete the file, follow these steps:

1. Right-click the file, and then click Properties.
2. Click the Security tab, and then click Administrators under Group or user names.
3. In the Permissions for Administrators area, click to select the Deny check box for all available permissions.
4. Under Group or user names, click SYSTEM.
5. In the Permissions for SYSTEM area, click to select the Deny check box for all available permissions.
6. Click OK to close the Properties dialog box.
7. Try to delete the file again.

If you still cannot delete the file, follow these steps:

1. Try to rename the file.
2. Restart the computer.
3. Open the %WinDir%\System32 folder, right-click the file that you want to delete, and then click Delete.
   

You can now restart the computer in normal mode. To do this, follow these steps:

1. Click Start, click Run, type msconfig, and then click OK.
   
2. Click the BOOT.INI tab, click to clear the /SAFEBOOT check box, and then click OK.
   
3. In the System Configuration dialog box, click Restart.
   

You should now be able to install the .NET Framework.

Note  Regardless of whether you can install the .NET Framework, we recommend that you visit the Microsoft Security Essentials website and perform a complete virus scan.