Is that Vista? :o
I agree with Aloshi, he dident say it but this is what he sorta ment "Omg thats not your problem but it sure isent a smart thing to run, vista" :P
Vista sucks BADLY. I had it for a month running with 512 mb of ram and when i added another gigabyte, there was almost no difference in gaming preformance
there is the perfict quote :) Also vista is very good at making you be a "Goodie Goodie two shooes" :) I have 2GB of RAM (Exatly, because a Gig is 1023 MB's, not 1000 MB's) and when I went onto vista for a try out it treated my 2GB of RAM as if it was 500GB of RAM :)
but thats not your problem and other people already awnserd in what way and the correct awnser in my eyes,
Yes, run as administrator or get the administrator to mess with permissions.