HaloMods "Classic" Read-only Archive

I recently upgraded my computer to Vista. Ever since then i have not been able to rebuild my map with HMT3.5. I get and exception saying "cannot access BuildTree.txt". so i looked in C:/ and open BuildTree.txt and the file was a halo made file i believe (came with the installation of the game). so i decided to reinstall the game once without repairing corrupted files and once repairing corrupted files. I tried to rebuild again but i got the exception. i tried deleted the buildtree.txt and that didnt work either. I tried redownloading HMT, and i restarted my computer. I still get the exception. could someone help me.

I am getting the exception in HMT not when i try to play halo...

excerpt from wiki:
[quote]
A variety of other privilege-restriction techniques are also built into Vista. An example is the concept of "integrity levels" in user processes, whereby a process with a lower integrity level cannot interact with processes of a higher integrity level and cannot perform DLL

so vista is not allowing HMT to use C:\BuildTree.txt?