The MS-7507 is indeed an LGA775 socket motherboard.
If this is the item in question and picture shows the actual item, it is a replacement for your current motherboard, see link.
[url=http://www.ebay.co.uk/itm/MSI-MS-7507-MAINSBOARD-MOTHERBOARD-SOCKET-...
If this is the item in question and picture shows the actual item, it is a replacement for your current motherboard, see link.
[url=http://www.ebay.co.uk/itm/MSI-MS-7507-MAINSBOARD-MOTHERBOARD-SOCKET-...