27gb is an unbelievable small disk. Even cheap computers today come with 100gb or more disk space.
You can try repair PT outside of PT like I told you before...
archives/PT2/viewtopic.php?t=234&highlight=repairDoing that doesn't do a backup.
Importing 100K hands is going to take up the rest of your disk space. So you need to consider another computer or you need to find some other files to delete in order to free up space.