Step 1:
Optimize Internet Explorer and also temporarily disable the antivirus software running on the computer and the then try downloading and installing the executable files and check if the issue persists.
How to optimize Internet Explorer - Method 1: Clear cached data in Internet Explorer
Disable antivirus software
Warning:
Antivirus software can help protect your computer against viruses and other security threats. In most cases, you shouldn't disable your antivirus software. If you have to temporarily disable it to install other software, you should re-enable it as soon as you're done. If you're connected to the Internet or a network while your antivirus software is disabled, your computer is vulnerable to attacks.
Step 2:
Place the computer in a clean boot state and troubleshoot the issue and check if it helps. You can start Windows Vista or Windows 7 by using a minimal set of drivers and startup programs. This cand of startup is known as a "clean boot." A clean boot helps eliminate software conflicts.
How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7
(Step 1: Perform a clean boot)
If your issue is resolved after performing Clean Boot, then follow the steps mentioned in the following KB article to narrow down the exact source: http://support.microsoft.com/kb/929135
Also, see the section on how return your computer to a Normal startup mode by following the steps under "Reset the computer to start as usual", after performing the clean boot troubleshooting.
Step 3:
If both above mentioned steps fail then, I would suggest you to try a system restore and check if it helps.
System Restore: frequently asked questions
Hope this helps. Let us know if you need further assistance.
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