ник: FORMAT
http://aquesthosting.com/sqlerror26
http://support.microsoft.com/kb/914277/ru
До кучи еще и это
http://www.google.com.by/search?hl=ru&lr=lang_ru&q=provider:+%D0%A1%D0%B5%D1%82%D0%B5%D0%B2%D1%8B%D0%B5+%D0%B8%D0%BD%D1%82%D0%B5%D1%80%D1%84%D0%B5%D0%B9%D1%81%D1%8B+SQL,+error:+26+-+%D0%9E%D1%88%D0%B8%D0%B1%D0%BA%D0%B0+%D0%BF%D1%80%D0%B8+%D0%BE%D0%B1%D0%BD%D0%B0%D1%80%D1%83%D0%B6%D0%B5%D0%BD%D0%B8%D0%B8+%D1%83%D0%BA%D0%B0%D0%B7%D0%B0%D0%BD%D0%BD%D0%BE%D0%B3%D0%BE+%D1%81%D0%B5%D1%80%D0%B2%D0%B5%D1%80%D0%B0+%D0%B8%D0%BB%D0%B8+%D1%8D%D0%BA%D0%B7%D0%B5%D0%BC%D0%BF%D0%BB%D1%8F%D1%80%D0%B0&start=0&sa=N