Administaff Inc., which provides temporary employees for small- and medium-sized businesses including in Central Florida, is warning 159,000 current and former workers that their personal data may be compromised because of a stolen laptop. The data wasn't encrypted when it was stored on the portable computer, which is password-protected, the company said Monday in a statement. The company said the computer was reported stolen Oct. 3. The theft was probably a random event, and there's no indication yet of improper use of the information, the company said. Administaff is offering current and former employees one year of free credit monitoring with fraud-resolution assistance. The confidential data was being compiled in response to a government reporting requirement and included names, addresses and Social Security numbers for most employees paid by Administaff in 2006, the company said.