Detect Remote Connection Or Intrusion History?

I'm both concerned and pissed off that my creepy housemate might've used our network to invade my privacy, steal expensive multimedia & valuable personal info, and may have continued access to my computers. I have a Win7Home laptop and a Win7Prof desktop. Both have a Windows password.I was attempting to back-up files from my laptop to my desktop ~2 weeks ago, so I created a Shared Folder and put files in there. After the copying was done, while I was moving the folders from the Shared Folder to a private folder on my desktop computer, there was an error message for one of the folders, saying it was open in another window... this was strange, since it definitely hadn't been opened within weeks by me. But it resolved immediately (like they got alerted). And of all the folders, it's one which my stalker roommate would def be interested in.

Also, I recently noticed that there are Remote Desktop Connection icons on both my computers (with "Allow" checked on laptop only). They were created 49 seconds apart, that NEXT morning. They reside in the same parent folder as where the shared folder resides (Documents folder on laptop and a Partition on the desktop). It is possible that I created the RDCs by accident while amateurly trying to network the my PCs, or could they be offspring from a trojan/DLL file which was placed in the Shared folder by my creepy roommate...? As "admin" over our router, would he have been alerted to the fact that I shared a folder? I'd enabled "Home" network and discovery for my computers. Could he access other NONshared folders if my computer was visible? Can router admins view a window that can constantly track network computer activity?