Download is interrupted or ends prematurely?

[Renteria]

I have been facing this problem for a while. I have tried whatever I could but no avail.

When I download some files over 100MB, they ends prematurely (download is completely with only some portion of it) or interrupted. When I bought this laptop, there was no problem like this.

I made some research for answers and tried downloading in IE, Firefox, Chrome - but didn't work.
I tried it after turning off my vaccine program - didn't work.
I tried using internet download manager - didn't work!
I tried it after deleting all the temporary files - nope.

This issue has been really a lot of pain to me now. Anybody has any idea??

Thanks.