I am receiving the following error and do not know how to correct this. Please help!

Event ID: 17052
Error: 9002
Severity: 17
State: 2
The log file for database ' ' is full. Back up the transaction log for the database to free up some log space.

The problem is that someone before me installed this on the C:\ drive and we now only have 64meg left on the C:\ drive.

Help! Thanks!