Can't download anything from email or internet

I am using win7 and IE9 and I can't download anything. I also use Norton Antivirus.

When I try and download an email attachment for example. Norton tells me the file is safe.

When I press download, I get a pop up. I try and run or save as per the pop up and the file begins to download. When it is at the end of the download, I am informed, via the pop, that it is running a security scan. I am then told the file couldn't be downloaded.

I'd appreciate any help.

Thanks to both.

My antivirus is up to date. It does it automatically.

I can't download anything, so the malewarebytes won't work at the moment.

It goes to a IE download file (I think) and when I try and open it, I get running security scan and I can't open it.

Thanks for trying guys

That's the problem though. Just when I think I have downloaded a file , the security scan runs and then I get, file can't be downloaded.