I'm having problems installing PR v0.95?

[NE-Rompers]

Before I start, I'm running my copy of BF2 on Windows XP.
I've recently gotten my BF2 copy fixed. Upon receiving this miracle, I immediately decided to install PR. Well, when I go to install Part 1 (of 3) I get the error :
Error creating registry key: HK_CLASSES_ROOT/pr
RegCreateKeyEx failed; code 5.
Access is denied.
Click retry to try again, Ignore to proceed anyway, or Abort to cancel installation.
Now, I've tried proceeding anyways, and when I install parts 2/3, I get similar errors. If I proceed with those, everything will seem to install fine, but when I go to start PR up, it shows that pre-launch picture, and then it goes away. It basically won't start. I've since deleted PR and re-downloaded it. I get the same error. How would I go about fixing this? Thanks.

[SnipingCoward]

Fixing the installation errors has priority.
It appears you are maybe lacking administrative priviliges which are required to modify the registry.
If your account does not have admin rights you can try to "Run as different user" in the right click menu (on the installer) or maybe simply switch accounts.
Maybe your AV is blocking the installer, temporarily turn it off during installation.

Also what do you mean by "BF2 copy fixed"? If BF2 is (still) corrupted chances are good that PR will not run.