A pc usually means either computer running windows or linux. If he were a linux user he wouldn't need to ask. And Mac/Apple users don't refer to their computers as pc's.
So If i'm right. There is a really super easy way of finding all your photographs since Windows Xp. In explorer. That is any window you use to discover files. Open up my pictures that is called a explorer window. On the top right there is a search option. If you don't see it. Like in windows xp. You need to enable it in "Control Panel". Instead of searching for the names of your images, just type in .jpg
If you know exactly what format your pictures are in the easier it will be to find them.
Also you can plug in your old hard drive into your motherboard (google it, pay some techy, have someone show you how) and access the hard drive. Then simply transfer the pictures to your new computer. TA da.
If the hard drive was your old system hard drive. You will find it easier to navigate the hard drive by going C drive, username, and whatever, my documents, my pictures, my videos, Desktop, Whatever.