Unfortunatly I have no idea, this computer has been in use for some time, and I was brought on several months ago so I do not know the history behind it. The employee who uses it says everything seems to work fine, only that she can not use speakers with it. that is one of the drivers that is corrupt. When I tried to install I turned off the anti-virus software (avast) and uninstalled, rebooted, shut off Avast again and installed. I also tried the same method the other day while the machine was in safe mode. As her computer is working ok, I have been putting off trying to run the recovery, or a full reinstall. Just seems strange that her PC can have so many issues but it does seem to work. Is there malware that might do this?