I am getting "not enough disk space. Please free xxx MB in c: drive" while installing "Toddlers Game - original CD" not only this cd. other games also fails. But installing s/w like omnipage, vp5, ulead video studio 6 that goes fine.

I installed many times before. But this time it fails

I have 37GB free space on C:\
Why I am getting this erorr?

what i did ? When I got this error? history is

1. installed w2k over 98 SE (formatted, used NTFS file system)
2. installed DirectX 8.1
3. installed ATI MMC 7.5. TV works perfectly.
4 installed a game cd. my kid played the game
5. installed UVS 6. DV capture works perfectly.
6 . I thought installing Vapour CD. cause I can put all my kids CD in HD so that they can play without cd by just mounting images.
I tried with one CD. it worked fine. after unmounting the cd i tried for second cd. setup failed and got "not enough disk space error"

But I have more that 37GB on C:
I tried to install on d: (20 GB free). Failed again

I uninstalled vapour cd.

Tried installing game cd. Failed !

How to solve this problem?
(i don't want to start from scratch)

Hope I will find solution here. meanwhile i will seach in NET also

Thanks