hi guys i am facing extreemly problem regarding virous on my website, due to which my web host are not hosting my sites now 
and most of the time i face hacking problems also please help me out to figure out these problems
my site urls are also working in my signatures
I would say: use better passwords, use better software, and use a better host. 
If you don’t have backups, you may be in a spot of bother. You could probably ask your host to send you the site files, but as I mentioned, just uploading them to another host will get you out of the frying pan into the fire.
Where was your site hosted?
Ralph is the only one with a correct answer as you’ve been hacked (or uploaded the viruses from your own computer). Use STRONG passwords (http://strongpasswordgenerator.com and use at least 11 characters with both cases, digits and special characters for both your host login (cPanel) and FTP)! Once you do that, delete all your files and upload them anew from your computer (after a thorough anti-virus scan, please).
Regards,
DK