The odd OS choice and more makes me wonder if the maker supplied you a good OS install.
Try some other OS as a test but my bet is some malware or any "download accelerator."
I need some help on an unusual problem, I think, as I have not been to learn anything by searches.. I cannot download files using IE 11 or Firefox 26. The files are constantly interrupted. In IE, I can download the file if I watch the download and keep resuming it whenever it stops. In Firefox, I can resume downloading only by closing and reopening Firefox. The kind of file seems not to matter. I have the same trouble with drivers, updates, linux iso downloads, mp4 files from Youtube, etc. The site also doesn't seem to matter. Very small files will sometimes complete before they are interrupted. At first I thought it was related to flash player. But I have the same problem with or without flash player. I have other PC's running Windows XP and Linux, and they don't have this problem.
Specs: AMD X4 9750, 4 GB DDR2 RAM, Windows 7 Home Premium SP1 32 bit, Avast A/V, DSL internet.
Thanks in advance for any help.