Its Win-Xp-Pro SP2

the problem is there is a kind of a link between programs that i install or
un-install that makes the remaining programs on the machine works in a funny
way.

I know that some times programs have shared components, but when i
un-install/install a program and the system never gives me a warning about
any shared components then there shouldnt be any problem .. i suppose.

what happens is, lets say i have programs (A,B,C and D) if i install other
programs (say E,F and G) or Uninstall one of the former programs (A,B,C and
D). The remainig programs on the pc (say B,C ) will not function properly and
when i launch any of them they will give out a little dialogue box saying (
Installing in progress)

what the hell ! it seems that i have to re-install programms i already have
on the PC !! and Nothing happenes after the dialogue box or installation
appears cos it does nothing ,, i have to insert the CD of the programm and
re-install it :-(

NOTE: that happens without any warning msg from the system that there are
shared components and installing/uninstaling may affect other programs!!!

HELP PLEAAAAAAASE :-( i have ben suffering from this for a year so far :-(