Right click on My Computer. Click on Manage. Go to Disk Management under Storage. Do you see your 30 GB partition as unpartitioned space? If so, you'll have to use a partition manager to resize your 130 GB partition to include that 30 GB. Otherwise, you can format that 30GB unpartitioned space and Windows will assign a drive letter to it--you'll get a second partition. Anyway, since your OS is already installed, you really can't recover it with windows, you'll have to use third party partition manager like Acronis Disk Director or Norton Partition Magic to resize your partition. These tools are designed to preserve your data. I would still backup before doing it, though.