Hi, there should be no problem at all. Your friend should just have to allow you in the Windows chat program, I forget what it's called these days.
The options were built right in if I remember correctly.
EDIT: OK, it's in the WLM(Windows Live Messenger) menu/ actions and request assistance, your friend has to ask you for help first, accept the defaults and you should be good to go. Just tell your friend when you're in not to touch the mouse or keyboard until you're done, otherwise she'll have to invite you again etc. Yes it's safe.
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