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If a DRM stripping program asks for a credit card number, it is probably for eReader or B&N ePub (which both use a credit card number as password). A search for convertlit GUI usually locates a good link in the first few options.
It is a general rule for DRM circumvention that it only works on your own ebooks and only if you can open them with the official reader app. So at a minimum you need your passport credentials. If you can remember your login name (email address), you can probably get the password. If not, as a last resort, try calling microsoft to see if they can help. I don't know if convertlit works with Windows 7, so you might have to find a Windows XP computer to get the needed password keys.
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