Software error when other account accessed on XP

I have Adware on my computer. Recently, I created a limited account for a friend to use my computer. The problem is that when Adware initiates, it states that there is an immediate error and must shutdown, just Adware not the computer. When I log in (Administrator)it works fine. I tried to re-install Adware, but since the account is limited, i can't do that I believe. What do I do? I want Adware running so when I'm not using the computer, I don't get a bunch of spyware and cookies clogging my computer.