I use BitTorrent 7.8 build 29676 - 32bit Windows XP, Avast Antivirus I often found CRC Error in most downloaded file.... and It only found in .!BT files, not in any other files. so, I think it's a bug from BitTorrent which fail to preallocate files or write .!BT to disk. The solution is I copy all corrupt .!BT files (which causing CRC Error) using 'Roadkil's Unstoppable Copier' (RUC) and set 'faster data recovery'. 1. Turn off BitTorrent. 2. Run CHKDSK to scan hard disk --- it will mark some byt