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When I try to access a computer I need to administer on the network (\\hostname\c$) I cannot put credentials administrator and password. Instead, I get a default guest account and am unable to change it, as the option is greyed out.

I know the administrator credentials, but simply can't use them.

Does someone know what the problem is?

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Have you tried Map Network Drive on Tools menu on your Windows Explorer? That allows you to sign in using a different user. – douglaslps Nov 21 '13 at 13:10
Could you provide a screenshot so we can see what is greyed out? – Kevin Panko Nov 21 '13 at 13:39
Miranda, please register your account here so you can edit your question and comment in it. @KevinPanko, screenshot added. – slhck Nov 21 '13 at 13:56

You have to Disable Simple File Sharing.

In Explorer window, select Tools -> Folder Options, then select View panel and there disable Use simple file sharing (Recommended)

Fix it here:

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