The problem is you didn't share "the errror" and the software title. Maybe armed with that a more precise reply could be found.
So let me share what I do when this happens. I go get the MICROSOFT INSTALLER CLEANUP UTILITY and look to see if there is a pending install to remove. It's a shame we have to do stuff like that.
i am using IBM laptop R51nq2887 model windows xp pro 2002 service pack 2
when ever is try to install a new software in my computer it says that error 1500 another installation is in progress finished tht and continue installation i cant instal any programs on my computer please help me.
this problem occurs when i install norton360 trail version and then i try to unistall it shows install cd and unistall so instead of that i delete the file location since then the problem is there help me