MS Query

I am pretty new to MS query in Excel and SQL. I'm trying to use a small .xls workbook as a relational database and use some SQL on it for practice. However, when I add the tables to the query the headers seem to change all the full stops into hashtags (for instance 2.5 becomes 2#5)- is there a way round this? I've tried formatting all the headers as text in the original .xls file unfortunately that doesn't seem to have worked.

I'm not familiar with this problem, but instead of text, maybe the decimal format will work.