Acer :: I Think Arcade Instanton Messed Up My Drive

i turn on my computer again and it goes to acer arcade instanton. i exit it and then when vista boots up it tells me to chkdsk. im suspicious but i skip it... when i login it tells me that my user profile is messed and thata bunch of stuff is corrupt. i then do chkdsk and luckily it manages to repair it and i still have my files. however all of my settings and user accounts are gone... also a lot of things dont feel right.

i think after backing up i might do a reinstall. just to confirm, if i use the recovery dvd, D:/ will not be touched right? (D:/ is where my files will be saved)