When the wallet has been installed, it asks for a boinc email address. I think this dialog is quite misleading as it indicates you NEED an email address. Usually, newbies will want to join a pool nowadays I suppose.

I propose to change the text to:

Welcome to Gridcoin.
In case you wish to become a "Solo Miner" you can now insert your BOINC email address and press "Ok". Attention: You will need a few thousand GRC to constantly create new coins within a feasible timeframe.
If you want to mine Gridcoin, we suggest to start as a "Pool Miner". You will not need an initial balance. Press "Cancel" in that case.
Read more at gridcoin.us

[Ok] [Cancel] (or we change OK to "Solo Mining" and Cancel to "Pool Mining and Investor" ?)

If Cancel has been chose, we need another popup because the current one is quite complex.

I propose:
You decided against "Solo Mining". In case you wish to become a "Solo Miner", insert "email=YourBOINCEmail" in the file gridcoinresearch.conf. To find it, visit http://wiki.gridcoin.us/Gridcoinresearch_config_file .

[Ok]