Is it Possible...???

I have cyber cafe, configuration is windows XP, 128mb ram, 20 GB HDD, divided in
3 (FAT32) partion. no server all are local pc.

C:\ ---> Main Windows, ms office,yahoo msn, etc.
D:\----> daily use size 1 GB
E:\----> Games loaded.

Now I want to give following access.
C:\ -- Read only.
D:\ -- all data shld be saved on D:\ but when
ever I restart my pc all data frm D:\
should erase. (It should work like RAM
DRIVE)

E:\---> Games are loaded so this also read only.

** ( can we creat image of D:\ using ghost) D:\ is empty drive, and it can be restored less than 1 minuts. so that every time i re-start pc. it shld get replaced automatically**

pls suggest me good solution to do above activity

thanks
Indian friend