Issue migrating IIS, PHP, and MySQL connection from XP to Windows 7

Hello all, 

I am not very knowledgeable at all when it comes to IIS (MySQL for that matter), so I was hoping someone could tell me what I'm missing: 

We have a Win XP machine that hosts a page for Specimen Label Printing, where they can print pathology labels to meet their specifications. It's a php webpage that connects to a MySQL database (locally hosted). It pulls information so they can select the year, printer, prefix, quantity, label format, etc. 

I am in the process of replacing that PC with a Win 7, as it's reached it's EOL. 

I installed IIS (with FastCGI), PHP, and MySQL on the new computer. I then managed to perform a backup and restore of both IIS and MySQL, so all the information in both of the programs matches exactly what I have on the XP machine. 

My problem is that when I try opening the webpage all I get is "MySQL Connection Failed", which I realized is the same message I get if MySQL isn't even yet installed on the machine. 

So obviously I'm missing a step somewhere, and the restore didn't actually establish the connection to the MySQL db, it looks like it doesn't see it at all. I'm hoping someone might have experience with something like this and could tell me if it's just additional files or commands I need to add somewhere. I thought maybe it was a connection string issue in IIS, but if it is, I wasn't able to get it figured out. 

I can upload any information that could be helpful, just let me know what you'd want to see. Thank you very much in advance!