Epicor Development

I got the below error during Epicor 9 client installation. "The Client installation requires 1000mb of free disk space but selected drive has 1000mb. Please select another location for installation"  I checked the disk space and I found there are 40 GB free so whats wrong?

Every business needs an intuitive and easy to use query engine. Epicor ICE 2.0 provides the business activity query (BAQ) Designer, which allows you to create personalized queries or to copy standard queries so that they can be modified. Once the query is created, it can be used throughout Epicor next generation business applications—to generate reports, for quick searches, or to view the results in a role-based dashboard. Epicor ICE BAQ lets you create queries that display the data you need, when you need it.