Hello i will talk about taking windows go back in Windows xp
NOTE:WITH GOBACKING PROCESS YOU CAN LOST SOME FILES.
Step by step
1-)Start>Run
2-)Write down msconfig
3-)In general sections **** "Goback system" button
4-)A menu will appear.There are 3 options.
a)Goback my pc
b)Create a goback point
c)Remove last goback
To goback your system select the first option "GoBack my pc" and **** next.Select the date you want to back from the calendar that you see.If you made a gobacking point before,now you can go back that point.
**** next.And wait pc to restart after restart you can use your fresh system like newly formatted ^_^