

The way that Windows Vista works makes the PC less likely to have system files altered by malicious software, however it can cause problems with older (pre Vista) software that will run within Vista but is, obviously, unaware of the new operating method.
Older programs will, usually, write information to the Program Files folder. Vista has this, and other areas, set as restricted access and any programs written for Vista should be writing their data to the Application Data folder within the users' own area. When a program tries to write to the Program Files folder and is denied it invokes the User Account Control (UAC) but the older programs don't "know" about the UAC and this may cause the program to hang or even cause a catasthophic system crash.


The program will now run in the elevated mode and be able to access the areas that are otherwise "off limits".
(The 2820 cloning software was used as an example, it works just fine in Vista without being in elevated mode).