Installed last night............no key available . Up and running and received key today.Will there be opportunity to enter it or should I re-install using key?Will the time limit of use only be 1 month due to no key?Any advice appreciated.Thanks

You don't have to reformat to insert the key.Just open the start menu, right-click on "Computer" and select "Properties" If you look at the lower half of that window you'll find a option that will let you insert a new key and register your copy of Win7Edit: stupid typo...

Much appreciated and all the best.