Permission&Access&User Amount Woes?

Permission is just my newest trouble! My computer crashed some weeks ago, & I never received a solution; I have Windows 7 Home Premium on, 32 bit, on a Toshiba Satellite laptop. It replaces one that was stolen from me; no frills is fine, but I have had many troubles! I am in exams online in grad school, so did not do my Performance Monitor/Error checking or anything, just working on schoolwork. But as I worked with reports, etc., I realized that all files in "My Documents" were also in (at least!) two other places: Public Documents and Pictures --

I went right to trying to move them, they were marked "Read Only", and I wasn't able to gain permission to ,make changes or move my files out of Public Documents, where they were "shared" & I was blocked from hitting "stop sharing" -- "didn't have the authority". When I realized they were also in Pictures, and set up as "Share" items, I was sickened; my very private documents on my computer system, & I didn't have the right to move my own files!

I am the Administrator, and I am the Owner; I live alone and nobody has used my laptop. *When I wrestled to restore my Permissions, I might make the changes, and "SYSTEM" seemed to be "in charge" -- my Full Control permissions were faded out, & when I would restore them, I could not click "Apply". Now unable to change permissions, or properties, I went to search for answers & was told to change the security settings at the root; I "enabled all authorized users to enable their permissions" -- that first time, it seemed to work & I was able to "un-share" my files; checked back to the root (C:drive), & it was back like before; my permissions faded & me blocked from clicking "apply" when I attempted to do what I did to get good results before.

I decided to do a "System Restore"; it did not make any difference. But there was an extra file (outside of the C drive System file called "System" when the Restore began. Bogus file called System?? Is that possible? Also, my Protection had been turned off; I had to re-set it and that has never happened.

I thought it could be a virus; ran the Microsoft program to detect Malware (am running Security Essentials); yet, I was told "no". It used to be so simple; my document files stayed in ONE location; & now I realize I have files in multiple locations and I neither did that nor authorized anyone to do that. *And I don't know how to move them with Internet Explorer; of course they are really located at "My Documents", so I am stopped from moving them out of the wrong place: "location is the same." It has been one really troubling matter after another & I hope there is some help for me.

I use a password, work from an Administrator Account; have changed passwords recently, & probably would have "let it go" tonight except that I was being exposed, and even now that (I think!) the share capacity was stopped (also went into Network Sharing & cut off "Network Discovery", I just feel so out of control with my own System & so vulnerably at risk: I have no idea how long my grad school and private documents weren't private!!