Basic Configuration in Biztalk server 2006

Hi,

I have installed Biztalk server 2006. i have Windows server 2003.

My computer name is GauravGarg and logging with username Administrator.

1) While configuring for the first time with Basic Configuration i get an erro in Groups: Message: GauragGarg\Biztalk server Administrators is not an valid domain group.

Pls tell what does it mean and what is the solution.

2) And one more thing how can clear my log files?

Please mail me at [email protected]

Thanks

Gaurav Garg