please help me to get access to my operaing system

i have 6 partitions on my computer and i installed 2 operting systems
(window xp professional sp2) in c and d drives
respectively. my d drive's operting sytem sends my document in g drive and it have its system files etc in d drive. it is
arranged by me.

now the acident that happend one day........

one day i am deleting some noneeded files from my computer. i am in d drive's xp at that time . suddenly some ~.tmp files
deleted by shift+delete. then computer suddenly restarts.

and till now whenever i tries to go to that d drive's xp from the list that comes when computer starts, it restarts again

so i cant access my d drive's operating system till yet

" i installed 2 operting systems (window xp professional sp2) in c and d drives
respectively"

Why do you have the same O/S installed twice?

Are C: & D: seperate hard disks or just different partitions on the same hard disk?

Check your (C:\)boot.ini file to ensure it points to the correct disk/partition for the D: install.

Run a file check on the O/S.

Click START, RUN, type in

sfc /purgecache

This ensures that system files are copied from your Windows installation media, and files which may be infected with malware or corrupted are not copied from your drive.

Then type in

sfc /scannow

Have your XP CD handy as you may need it.