I apologise for being a NOOB by asking something that may have been discussed here already but I did search the board and couldn't find a definitive answer to my problem.... Somebody please advise! I had a USA WII (NTSC) with D2CKey running system v3.2U and worked perfectly with more than 30 copied WII games (all NTSC-USA), including SSBB. Last month I downloaded Mario Kart WII and found out it was PAL version from Europe. When I put the game in a message on the screen indicated something about 50hz/60hz and asked if I wanted to continue anyway. I said "Yes" and the game worked perfectly anyway, including all my other NTSC-USA games also. No problem at all,, until LAST NIGHT... I did the system update from v3.2U to v3.3U. Now my Mario Kart WII (PAL) says "system files corrupted". After reading some forum messages on this site, I have made sure that I do NOT have any duplicate channels. All my channels work fine, including NEWS and WEATHER. I can still go to my WII SETTINGS screen, and firmware now reports v3.3U. I tried to download the USA "Semibrick" fix that I saw on other sites, even though I'm not really sure I even have a "semibrick" condition. The DVD it made would not install. I went back to try some of my older WII games and some of those didn't work also, although I can't pinpoint it to my system update, as some of the games have minor scratches may not work anyway... My SSBB (NTSC-USA) still works fine and a copy of Mario Strikers Charged and several others I tried, but Mario Kart WII (PAL) continues to say "system files corrupted". What the hell did I do? Obviously I'm thinking I need to downgrade back to v3.2U where EVERYTHING worked fine... What do you guys suggest?