Vista - System Restore messed up settings!!! Please Help

I believed System Restore screwed up some settings on a work pc.

This is what i did. Firstly, i changed the appearance of XP Pro by right clicking my computer -> properties -> advanced tab -> settings -> adjust for best appearance. (Originally the theme was set to Windows classic) i changed the settings, and all was fine...then i wanted to return Windows classic theme view) but, instead of going to the display properties to revert back to Windows classic, i did a system restore to a few hours prior.

Once i restored the system, only a few desktop items appeared and all the settings for thunderbird, firefox etc were at a default state. Even the wallpaper got removed. Everything has to be reconfigured. I searched for existing files and found them, so sounds like the files are ok, but how can i restore the system?? The hd is partitioned into two drives. OS and Data.

Really need some help...big time!!! This is a work PC...