What is the complete error message that you get?
The issue with the computer regarding the download must be different.
Try the following methods and check:
Method 1:
Step 1: I would suggest you to boot in safe mode with networking and check if you face the same issue.
To boot into safe mode refer to the link provided below:
a) Restart the computer.
b) Start tapping the F8 key.
c) You will get advanced boot option window.
d) Select the option “Safe mode with Networking”
Refer to the link provided below for more information on safe mode:
Start your computer in safe mode
Step 2: I would recommend you to place the computer in clean boot.
You can start Windows Vista or Windows 7 by using a minimal set of drivers and startup programs. This kind of startup is known as a "clean boot." A clean boot helps eliminate software conflicts. The following article describes how to troubleshoot problems in Windows Vista or in Windows 7 by performing a clean boot:
How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7
How to perform a clean boot to troubleshoot a problem in Windows Vista or Windows 7
Note: Put the computer to normal as mentioned in Step 7 from the KB article.
If the issue doesn’t persists when the Computer is in clean boot or while in the Safe Mode with Networking, then the issue is confirmed to be caused by a certain non-Microsoft applications.
Method 2:
Run a virus scanner and check:
Virus are known to cause these issues. Scan your computer from Microsoft Safety Scanner, which helps to get rid of virus, spyware, and malicious software.
Microsoft Safety Scanner - Antivirus | Remove Spyware, Malware, Viruses Free
Note: The Microsoft Safety Scanner expires after 10 days from the date of installation.
Note: Any data files that are infected may only be cleaned by deleting the file entirely, which means there is a potential for data loss.
