given that you have had problems (see other thread fellow forum members for info) click here
I would suggest that you try and see if you have any restore points to before all this happened.
Start > All Programs > Accessories > System Tools > System Restore > green dot in 'Restore my computer to an earlier time' > click on 'Next'
In the calendar that then appears the days that are in heavy bold type are the ones that you can restore to. > Follow the on screen instructions or post back in this thread with the dates available and ask for more help.