Merge Duplicates causing Hoster to not respond

[stefbeme]

Originally yesterday, I added about 20 files to an existing folder, I rescanned the folder were the files were added. Then (of course during a show) I get a 911 from my husband that there were many songs missing. He went to tools>songs database>rebuild database>no resolution>I then rescanned each individual folder>no resolution>I then looked at my excluded folders>added a few folders that were questionable>no resolution at this point the amount of merge files has now grown, each time I did each of the above steps. When I attempted to merge, Hoster would then freeze (not responding). We rebooted, attempted to merge several times, each resulting in freezing Hoster.
I am assuming after reading your reply, that I am (and have always) been adding new files incorrectly so I may need the best direction on how to accomplish this.
I have searched the Quarantine folder, and no files have the song title, numbers only therefore am unable to determine if the files are included in this folder.
MergeSongDBLog.txt>the only file that exists is dated March 21, 2013 which does not correspond with my attempt on 8/9/13.
BuildSongErrors.txt - the missing files are located here and I have identified there are MANY files in this txt that are not appearing in my current listing in Hoster (this gives me hope)