Where can I go on the web to get a free scan that doesn't require for me download it?

Hi

Try here
Trend Micro HouseCall - Free Online Virus and Spyware Scan - Trend Micro UK

BitDefender Online Scanner - Free Online Virus Scan

Free Virus Scan - Kaspersky Lab

All good scans that I have used myself.
I hope that you have an installed anti virus though,don't just depend on online scanners.They are OK as a second line of defence but you should really have an installed anti virus prgram.

:)