So generally for wrinkles like that I would duplicate the Background layer, then use the Patch and Clone tools to get rid of the troublesome wrinkles entirely; then lower the opacity of that layer to let the wrinkles re-appear slightly in a natural-looking way.
Just to check, have you read this?
Doesn't go against it at all. You'd just make the Blacks slider your very last step, and move it as low as you wish to get rid of detail you don't want. Just be VERY careful not to get rid of detail you do want.
Holy crap.
Firstly, are you aware that Microsoft has now (as of a few days ago) stopped supporting Windows 7 with security updates? So you will be increasingly vulnerable.
But anyway, 4GB of RAM is far too little to run Adobe software. You MUST invest in a newer computer pronto.
As far as raw processing goes, you'll enjoy more powerful batch-processing capabilities from Bridge than you ever had with PSE. Do you have Bridge installed?
But mainly, it's the Levels Class you need to read again. It's all different.