Sorry for my english. I have "error 1003" with 5.50 last update installed on windows 7 x32. But 4.53 from my CD works great. I think it's some problems with LD2000.dll library, because i tried install both versions of LD2000 in deifferent paths on HDD, and, if 5.50 was installed after 4.53, it's dosn't works. In another case, when 4.53 installed on 5.50 update, it's works, but 5.50 has "dll entry point" problem. Can you help me?