1. How to launch the Character Map:
Press Windows Key + R, type charmap, press OK.
2. What to do if above command doesn't work:
Press Windows Key + R, type appwiz.cpl, press OK.
Click on Add/Remove Windows Components (third button on the left pane).
Select Accessories and Utilities, and then press on the Details button.
Select Accessories, and then press again on the Details button.
Check the box next to Character Map.
Press OK. Press OK again.
Press Next. Press Finish.
Close the Add/Remove Programs Wizard.
3. How to insert a symbol in MS Word:
Go to the Insert menu, and click on Symbol. If you do not see Symbol in the drop-down menu, click on Insert twice, to unfold the whole menu.
On the Symbols tab, make sure you are viewing the right Font you intend using. To insert a symbol from your font currently in use in your document, click the down arrow on the right side of the Font box and select (normal text); this is actually the first from the top of the list.
Select the symbol you want, click Insert, and then click Close.
A couple of questions for you:
a. Can you type @ anywhere except MS Word, or not at all?
b. Some localized keyboard layouts have @ (SHIFT + 2) and " (SHIFT + ') swapped.