i make dll file for serial driver that will load by another program, it was written by C++ and Assembly when i use it on windows 98 it work very good but when i decide to use it on windows xp there is an error message appeared and it doesn't work so what i can do what is the best solution and is i can change any settings of windows or not thanks

dll files
calmal20
If you’re having a hardware issue, please contact hardware manufacturer or reseller. If you having an issue with 3rd party software, please contact respective software manufacturer or reseller. Otherwise please post to relevant forum or news group:
http://support.microsoft.com/newsgroups/default.aspx
Closing as off topic.