Hi 4emily,

I just tested a fresh win 7 install, it seems to work like this:

First of all: go to your click Organize (upper left on a file explorer), click "Folder and search options", then:
-Check Show Hidden Folders
-Uncheck "Hide extensions for known file types"
click Apply/Ok
 

Dl the Opal-Qt, you did
Install the Wallet, and... let it crash
go to C:\Users\Yourname\Appdata\Roaming\Opalcoin
Save your wallet.dat in another folder, erase all the files and folder in Opalcoin,
Then create a new opalcoin.txt with the notepad (or better with notepad++)
copy paste these addnodes in it:

do not add other argument.
save the file as:
opalcoin.conf
Beware ! when i did that, i saw an:
opalcoin.conf
file but, as i did not uncheck the "Hide Known file extension" the file's real name was:
opalcoin.conf.txt (.txt hidden)
You will be warmed "if you change the file extension, the file should be non-readable" or something like that, ignore it, We need a simple opalcoin.conf
the opalcoin.conf file must change from a white and blue stripes .txt icon, to a white .conf icon.

Once you only have this opalcoin.conf, in C:\Users\Yourname\Appdata\Roaming\opalcoin
Restart your wallet... and tell me