If the rear USB ports are physically wore out, there's not much you can do about that other than add a USB2 or USB3 add-in card if you have a free expansion slot. I see that little board comes with a PCIe X1 slot and a PCI slot. If you have a gfx card in the PCIe X16 slot, it probably covers some or all of the PCIe X1 slot.
Examples:
PCIe X1: http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007531+600022031&QksAutoSuggestion=&ShowDeactivatedMark=False&Configurator=&IsNodeId=1&Subcategory=73&description=&hisInDesc=&Ntk=&CFG=&SpeTabStoreType=&AdvancedSearch=1&srchInDesc=
PCI: http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007531+600022008&QksAutoSuggestion=&ShowDeactivatedMark=False&Configurator=&IsNodeId=1&Subcategory=73&description=&hisInDesc=&Ntk=&CFG=&SpeTabStoreType=&AdvancedSearch=1&srchInDesc=
Back to the MB replacement...
Here is a replacement comparable to what you have now:
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157359
Here is the website for the board where you can find information and downloads: http://www.asrock.com/mb/Intel/G41C-GS/