I work for a company that setup a website, this one thelinearshop.com (warning this site contains malware so don't go there if you are concerned), before I started working for them. The site uses OSCommerce. It now looks like someone was able to infect it with a malware link and jumble the site itself and when I visit the site I get a warning page from Google with the choice to leave, go to http://safebrowsing.clients.google.com/safebrowsing/diagnostic?client=Firefox&hl=en-US&site=http://thelinearshop.com/ for info on why it is getting blocked, or to ignore the issue.
I have looked at the site and someone definitely hacked it. I have never run into this before and I am not sure how to proceed in order to get this fixed. I know I need to get the virus out but I am also concerned that whoever set the site up used an older version of OSCommerce and that it must not be very secure. Is that the case?