As Michael pointed out if you need version 2.0 XSLT then use Saxon.Net, it's a fantastic processor and the basic version is free. If you want to stick with 1.0 then that's up to you.
What problem transformation do you have?
Remember though that this a forum where people are happy to give of their time freely to help those who are stuck with specific problems, not a software development service for complete applications.
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Joe (
Microsoft MVP - XML)