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Windows won't install any software - files are corrupt
I have a HP Pro 3515 running Windows 7 Professional 64bit and it won't install, literally, anything. There are different messages for almost every single application I try and install. E.g. we are trying to put ESET Antivirus on the machine but it throws out error "The cabinet file 'core.cab' required for this installation is corrupt and cannot be used."
I have tried un-registering windows installer and re-registering. I have re-registered all .dll files. Tried installing Microsoft Fix It, which doesn't run because nothing will install. Have tried a System Restore but still nothing works. In an attempt to eliminate the possibility of it being a virus I tried to install AdwCleaner, Malwarebytes and ComboFix - all come back saying installation file is corrupt. I have tried, repairing the msiexec reg entry but still no success.
PLEASE HELP!!