Hi tinlam!
When you reinstalled Little Reader and Little Math, did you use your installer and content CDs (included in your box sets) or did you download the newer files from your BrillKids Account?
Kindly send us a Diagnostic Report so we can start troubleshooting immediately.
For instructions on how to create a report, please refer to this article -- do make sure to create the report using Start > BrillKids > Support Tools so you can create just 1 report file for both Little Reader and Little Math:
http://support.brillkids.com/entries/20438423-how-to-create-a-diagnostic-report-for-your-brillkids-learning-systemAfter creating your report, please send it directly to support[at]brillkids[dot]com and include details about how you reinstalled LR and LM and any error messages that you see on screen.
We'll be sure to watch out for your email.
~Kezia