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Umm…did you consider asking her to give you admin access again!
This is the moderate suggestion in all the aspects. You should ask your sister to gain access.
May be she is the one, holding the authoritative access to the computer and is not willing the computer being messed up with unneeded stuff. I really think you should request your sister with valid reasons…
but if you are some what good in understanding command line interfaces. You can use the “Offline NT Password & Registry Editor” as Osman has provided the link above. But you are gonna need having another computer and a cd writer to write this bootable tool to a disk.
I also have tried the Offline NT Registry Editor. I, however, was able to do the following changes with this tool successfully.
Removing Password, Edit the Password, Changing the User type from limited-admin or admin-limited.
It worked great…
I would only advise to use this tool if you are really good with command line instructions, or you may destroy various things on your computer.
Besides every thing I would again advise you to request your sister for it…