This morning when I tried to install an update to Piriform Defraggler from FileHippo I got this error message




Two days ago, I was having trouble with my keyboard not functioning properly and after I got that sorted I did a full diskcheck; I noticed that in the summary it said that Windows had made alterations to the file system and compacted the security stream(at least that is a rough idea of what it said ! ).
My computer is working absolutely fine in all respects but I cannot install software updates. I have run a Malwarebytes quick scan and it found nothing untoward and I disabled and then re-enabled User Account Control. I am the administrator of this computer and there are no other users. I should be very grateful for any suggestions !!

Welcome
Make a full anti virus scan. Malwarebytes is excelllent, but if you do not have an anti virus, download Microsoft security Essentials. Make the scan use Security Essentials to protect you in the future.
Then if negative, use System restore, back a week before the problems began
System Restore - How to
http://www.microsoft.com/en-us/secur...s/default.aspx

Thank you for your help. I have now fixed the problem, I restarted in Safe mode and was able to install the update. I then rebooted and checked my firewall which had blocked the update. All is now running OK . Thanks again.

York,
One of my habits in obtaining updates is to right click on(example) Malwarebytes and run as Administrator then download the updates.

I do that with SAS, CCleaner, MBAM and even MS when the send out updates.
With MS updates I download all the small ones first then the larger updates I download them one at a time.
So far the method has worked beautiful for me.
Might want to give it a go and see if it works for you. IMHO
THW