System Restore Incomplete Question

dfjama

This is my problem with incomplete sytem restore.
I have downloaded an .exe file and when I run it , it automatically restarted my system, then I tried to restore my sytem on three different restore points:
1- Installed Adobe reader9 Sunday May 03, 2009
2- System Checkpoint on Saturday 02 May, 2009
3- Software Distribution Service 3.0 Friday 01, May 2009

All of them gave me Restoration Incomplete message
Your computer cannot be restored to ..so.and...so..(date & time)
No changes has been made to choose another restore point, restart system restore point.

it is not only this occasion, I had the same issue with several times with different occasions, so beside system restore being turned on by default is there anything else needed in order system is restored successfull......

Many Thanks