No you cannot.
No
This happened to me. When you create your Xbox Live Gamertag make sure you are logged in with your standard Gamertag. Complete the process to make the account and everything will be exactly the same as it was before but ur xbox live gamertag will takeover your offline Gamertag. It will have all your old game files and achievements, the name will be different.
yes it will act as if u r signed in on ur xbox though and u cannot be on both at the same time. U can earn achievements as well that will transfer to your gamertag and send messages etc. add my xbox live gamertag aDrenaLyN II
If you have a new Xbox and want your gamertag on there, just use the recovery gamertag option. This option is in where you can choose what gamertag you want to sign in with. You will need a transfer cable to transfer all your saved data, demos, add-ons etc to your new Xbox.
No, achievements only save to one account, and accounts cannot transfer achievements.
To transfer Microsoft Points (not abbreviated SC) from one MSP account to another, you need to log into your account. Next go to messages and select the account you want to transfer the points to and select enter gamertag.
Not unless it was either a glitch, or if the achievements were earned wrongfully.
You cant.
no my friend tried but he couldnt so you cant transfer information off your hardrive to another hardrive
no you can not transfer the achive mens to each one i tried lol
You can't. Purchases are tied to the Gamertag and console. If you purchased it under your Gamertag, you can try to transfer the licenses: http://www.xbox.com/en-US/support/systemuse/xbox360/licensemigration/faq.htm If you purchased it under his Gamertag, you will have to purchase the songs again for yourself.
It takes so long because it has to recover achievements and anything linked to your account, such as purchase liscences, so the more achievements and things you bought the longer it will take.....i think