I am unable to install some programs on my XP machine .. two in particular are Yahoo Instant Messenger & AdShield. I am attaching a screen shot of the error message. With some programs I have been able to work around the problem by opening the .exe file with winzip & extracting/installing that route. But in the case of these programs, nothing works. I know from surfing other boards, forums, MS knowledge base etc... that others have the same problem & noone seems to know the answer. Any chance someone here can help? I am running a PIIII, 512mg RAM ... brand new machine.