Error "Access is denied" when trying to use checkpoint to develop package in BIDS

Hello, thanks for reading.

I am currently working through the SQL Server 2008 Training Kit for BI Development and Maintenance, and am fairly new to SQL Server so bare with me. System is Windows 7 64-bit.

While developing a package I have set up a checkpoint to C:\DimCustomer_Checkpoint.xml, CheckPointUsage to IfExists, and SaveCheckpoints to True. When I run the package, I get an error stating:

Error: Checkpoint file "C:\DimCustomer_Checkpoint.xml" failed during creation due to error 0x80070005 "Access is denied."

I am the administrator for the system so not sure how else to proceed, if anyone can offer some guidance?

Thanks!