Tanknology, for your XP system, first of all I'd like to know if you only placed your replays in
C:\Documents and Settings\USER_NAME\My Documents\StarCraft II Beta\Replays
If so, place them in C:\Documents and Settings\USER_NAME\My Documents\StarCraft II Beta\Replays\Recent
As for the SWF folder, this sometimes cause problems. So I suggest you delete it, and use the sc2loader in the torrent I linked before. The tutorials are included in the readme file. (Install a fresh copy of Sc2Beta, patch it, then just extract the content in driveloader-1.0 inside your installation folder, that should do the trick for AI games AND replays). Of course copy the cache too.
C:\Documents and Settings\USER_NAME\My Documents\StarCraft II Beta\Replays
If so, place them in C:\Documents and Settings\USER_NAME\My Documents\StarCraft II Beta\Replays\Recent
As for the SWF folder, this sometimes cause problems. So I suggest you delete it, and use the sc2loader in the torrent I linked before. The tutorials are included in the readme file. (Install a fresh copy of Sc2Beta, patch it, then just extract the content in driveloader-1.0 inside your installation folder, that should do the trick for AI games AND replays). Of course copy the cache too.