Is there a way for real time monitoring and scanning of new downloads without having to scan every file you open on the computer?

I like the idea of having a new file scanned that I download online, but everything that I click on now is having to be scanned. Everytime I open a word processor, I have to wait until it scans that word processor. Everytime I open a file in "my documents", I have to wait for it to scan that file. etc...

Any way around this?

Thanks!