Malware report on archive.

[محروم.كوم]

Hi all
My site is running 3.7.2. I have had an email from google saying there is malware on the /archive. When i look at the webmaster tools in the google account this is the errors i find.

Code:
URL: http://www.myforum.com/archive/index.php?t-8701.html
Last checked: September 8, 2010


Suspected injected code Instances

and also

Code:
URL:http://myforum.com/archive/
Last checked: September 8, 2010


Suspected injected codeInstances

How do i get rid of this and what is the t-8701.html at the end of the archive/index.php

Thanks for your help __DEFINE_LIKE_SHARE__