corrupting downloaded files

[silver bullet]

hello everybody ......
I'm using an hp laptop with windows 7 home basic 64 bit . I have a big problem in downloading files . Whenever I download any file from the internet with any extension and try to open it , it says "File Is Corrupt" . Also , while playing a youtube video , it stops playing suddenly , although the grey tape ( that shows the downloaded part of the video) is full . I tried many different browsers , also i tried downloading youtube videos using real player , it always doesn't work .......

Please help !!!

 

[flashdrives]

maybe there's a virus in your system. You should run a full system scan with your updated AV. Of maybe there's a problem in your hard drive.