To get the MCSA you must meet all requirements, which include taking the 70-210, 70-215 and 70-218 exams (or A+ and Network+, A+ and Server+ combinations). If your other credentials meet the other requirements, the answer to your question is yes; if not, the answer is no. I don't see enough information here to answer your question more specifically since you don't tell me what MCP exams you have already taken and passed. Sorry I couldn't be more helpful.
This was first published in November 2002