IMO, since you chose a ready-made template that looks like crap, I'd scrap the entire site and learn how to do your own site using a quality HTML Editor ( NOT FrontPage! ).
You have a javascript running in the background which, even on high-speed internet, took your site forever to load -- SE's don't read javascript, so I'd get rid of it.
As for your coding errors -- you have 573 of them, and here's a "partial list":
line 118 column 623 - Warning: unescaped & or unknown entity "&_Version"
line 148 column 94 - Warning: unescaped & or unknown entity "&align"
line 148 column 106 - Warning: unescaped & or unknown entity "&valign"
line 148 column 117 - Warning: unescaped & or unknown entity "&_Version"
line 218 column 298 - Warning: missing </font> before </p>
line 218 column 290 - Warning: missing </strong> before </p>
line 218 column 339 - Warning: discarding unexpected </font>
line 1384 column 72 - Warning: entity " " doesn't end in ';'
line 1584 column 69 - Warning: discarding unexpected </input>
line 19 column 2 - Warning: <body> proprietary attribute "bottommargin"
line 19 column 2 - Warning: <body> proprietary attribute "leftmargin"
line 19 column 2 - Warning: <body> proprietary attribute "topmargin"
line 19 column 2 - Warning: <body> proprietary attribute "rightmargin"
line 19 column 2 - Warning: <body> proprietary attribute "marginwidth"
line 19 column 2 - Warning: <body> proprietary attribute "marginheight"
line 26 column 168 - Warning: <script> inserting "type" attribute
line 43 column 7 - Warning: <tr> attribute "height" has invalid value "62px"
line 44 column 27 - Warning: <img> attribute "id" has invalid value "_ctl2__ctl1__ctl0_PortraitLogoImage"
line 62 column 481 - Warning: <img> lacks "alt" attribute
line 148 column 1 - Warning: <table> proprietary attribute "background"
line 358 column 2 - Warning: <img> attribute "id" has invalid value "_ctl2__ctl9__ctl0_rp_681479_681479_fl_LR__ctl2_PP_ zi"
line 938 column 8 - Warning: <div> attribute "id" has invalid value "_ctl2__ctl9__ctl0_rp_681479_681479_fl_LR__ctl12_PP _cpp"
line 940 column 2 - Warning: <div> attribute "id" has invalid value "_ctl2__ctl9__ctl0_rp_681479_681479_fl_LR__ctl12_PP _aip"
line 944 column 122 - Warning: <img> attribute "id" has invalid value "_ctl2__ctl9__ctl0_rp_681479_681479_fl_LR__ctl12_PP _li"
line 948 column 2 - Warning: <img> attribute "id" has invalid value "_ctl2__ctl9__ctl0_rp_681479_681479_fl_LR__ctl12_PP _zi"
line 1457 column 1 - Warning: <table> proprietary attribute "hspace"
line 1457 column 1 - Warning: <table> proprietary attribute "vspace"
line 1490 column 6 - Warning: <a> attribute "id" has invalid value "_ctl2__ctl11__ctl0_ftr_rtdl__ctl14_h3"
line 1494 column 6 - Warning: <a> attribute "id" has invalid value "_ctl2__ctl11__ctl0_ftr_rtdl__ctl16_h3"
line 1505 column 4 - Warning: <a> attribute "id" has invalid value "_ctl2__ctl11__ctl0_ftr_plp_PrivacyPolicyPopup_Hype rLink"
line 1505 column 4 - Warning: <a> proprietary attribute "window_props"
line 1582 column 4 - Warning: <div> proprietary attribute "headertext"
line 1582 column 4 - Warning: <div> proprietary attribute "showmessagebox"
line 1582 column 4 - Warning: <div> proprietary attribute "showsummary"
line 1593 column 1 - Warning: <input> attribute "id" has invalid value "__VIEWSTATEENCRYPTED"
line 211 column 4 - Warning: trimming empty <strong>
line 212 column 41 - Warning: trimming empty <font>