NewSID disaster 500.000$ involved.

Hello,
Can you please help me, I have "lost" my data from pc after using NewSID http://technet.microsoft.com/en-us/sysinternals/bb897418.aspx. I tried to change sid and then after 40 min of display message "changing new sid" I restarted computer. After reboot I got an little surprise, All my files are gone, some programs loaded from programfiles. Then I saw that there are two users in the user folder, before, was only one called "mis" (no password) and now there is this second user"mis.mis-PC" from here I can access program files, documents (empty), desktop (empty) but I cannot use most of the operations that use "user account control" so I cannot access user "mis" because popup asks me to enter password to gain control, but there is no field to enter password and the "OK" button is grey (nonclickable). When I want to switch user there are: "mis" and "other user" icons. Same problems are found using any of them...
Can you please help I have data of my work form 6 months ago, ( I know backup , backup...) and losing of that data would be disastrous for my work 500.000$ value ( I know: backup , backup...), but please if you could help me with this, it’ll save my life. Thank you.