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 (http://housecall.trendmicro.com/uk/)

BitDefender Online Scanner - Free Online Virus Scan (http://www.bitdefender.com/scan8/ie.html)

Free Virus Scan - Kaspersky Lab (http://www.kaspersky.com/virusscanner)

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.

:)