I understand that you are unable to download any program using Internet Explorer.

Let us try fixing this issue by following the methods given below, before we proceed please provide the required information.

1)      Are you using Internet Explorer to download programs?

2)      Do you remember making any changes prior to this iisue?

I would suggest you to follow the methods given below and check if the issue persists.

Method 1: Disable software with invalid signature to run in Internet Explorer

a)      Open Internet Explorer browser from Desktop.

b)      From the menu bar select Tools SelectInternet Options.

c)      In the Internet Options window, select Advanced tab.

d)      Scroll down and un-check the Allow software to run or install even if the signature is invalid

e)      Click OK to save the settings. Then close the Internet Options window.

If the issue persists, try resetting the Internet Explorer and check if the issue persists.

Method 2: Reset the Internet Explorer.

Click the link and follow the steps “How to reset Internet Explorer settings”

http://support.microsoft.com/kb/923737?wa=wsignin1.0

Disclaimer: The Reset Internet Explorer Settings feature might reset security settings or privacy settings that you added to the list of Trusted Sites. The Reset Internet Explorer Settings feature might also reset parental control settings. We recommend that you note these sites before you use the Reset Internet Explorer Settings feature.

Hope the information helps to fix the issue you had in downloading programs. If you have any further queries, or any queries related to Windows, feel free to post. We will be glad to assist.