Question, if after you open LW, go to Tools>Options>Saving & see who's shared folder you are in. Is it under the name you log in under? (Or you could search your computer to find this out anyway.)

Sounds like something amiss with the admin settings. Go to control panel folder>Admin Tools>Computer Management>System Tools>Local Users & Groups>Users & check the admin users & rights.

I'm not a win user per se so the others will have a better idea here.