I only just realized that I can't get Windows XP updates manually.
If I have IE7 sand boxed as normal, I can go to "Microsoft Windows Update" however when I click check for updates nothing happens, I just get some error message.
I tried getting updates without having IE7 sand boxed, and every thing seemed to work.
You could come over to the Sandboxie forum and ask Tzuk the author of Sandboxie.No need to register.
Sandboxie also prevents programs executing inside the sandbox from loading drivers directly. It also prevents programs from asking a central system component, known as the Service Control Manager, to load drivers on their behalf. In this way, drivers, and more importantly, rootkits, cannot be installed by a sandboxed program.