Google says "This site may be hacked"

[Timbow]

It can happen that a lot of bad files get put in amongst your site files. I believe it is to do with shared hosting although hosting companies never admit it. If you can confirm that there are some random files of code in your directories it is well worth cleaning them out. Not so easy to do though. Reinstall from scratch with a fresh copy of GS and a backup site archive, but be careful that you aren't reinstalling bad files with the backup.