This tip is very similar to the following:
These tips need to be merged – see the merge guidelines.
In Vim, the unnamed register is the " register, and the Windows Clipboard is the * register.
This means that if you yank something, you have to yank it to the * register if you want to paste it into a Windows app. If this is too much trouble, set the 'clipboard' option to 'unnamed'. Then you always yank to *.
So pasting to windows apps doesn't require prefixing "* :