I am cleaning a laptop. The hard drive is 70GB and 68GB are full. the total data size in this laptop is 5GB. I have been looking for everyewhere and I can't understand what can be deleted. I run a software to discover wha take so much space and it tells me that 28GB are taken by the OS and another 17GB by the system files. How can I I find out what exactly to delete without incurring the risk to delete some OS important files. The software I run doesn't give me the location it gave me only a pie chart.
It's an 7 years old laptop running vista 32 bits.
Any advice please ?