Error establishing a database connection

My ISP suspended my blog because they found malware and stuff. I deleted the files they found and now:
Error establishing a database connection

I was not given an opportunity to backup my wp.

I did download the files.

Starting with a fresh install, I tried and failed to insert wp-content.

Trying to connect with my old database has failed.

I can’t even get to the wp shell.

Any suggestions that actually work. I want my blog back.

Thanks in Advance,

Walt

The page I need help with: [log in to see the link]