|ok, a couple of easy possibilites.|
Have you tried downloading in safe mode?
Have you tried loading your browser without extensions(this can be accomplished with a right click)
Have you checked your proxy settings(this can be found under internet settings:local connentions)
If you are able to go online and are able to try running trend micros house call(online scanner)
If you are able to can you download malwarebytes to another computer and run from a disk, or flash drive?