It was one of those Sempron single core machines with 512MB and ... Vista.
The cure was to replace the machine as we couldn't swap out the CPU.
It's been like this since the moment I received my computer a few years back, and now its getting irritating. When I download stuff, and when its finished, I click the "setup" icon, and i have to wait from 5~10 mins before the UAC panel comes up and asks me if i should allow it or not, after clicking yes it takes another 3~4 mins then the installer pops up. Would anyone like to inform me on how to fix this problem?