security malicious toolkit etc need removed....

Hello...I need an expert to remove the threats below and ensure my site is safe for users ..Also need expert to tell me how I received these in the first place....and to prevent them from coming back in the future... Drive-By Downloads (what's this?) Threats found: 15 Here is a sample: Threat Name: HTTP MS Unsafe ActiveX Obj Instantiation Location: [login to view URL]:uxHa8reMaTAJ:www.folkcorp.co.uk/classifieds/index.php+v4-team+hackers&hl=en&gl=us&strip=0 Threat Name: MSIE [login to view URL] Object File Installation Weakness Location: [login to view URL]:UMcksge4KWMJ:www.vierlander-vermogensbeheer.nl/pagina/werkwijze_uwadviseur/index.html+vierlander+effecten&cd=10&hl=nl&ct=clnk&gl=nl Threat Name: HTTP MS Unsafe ActiveX Obj Instantiation Location: [login to view URL]:uxHa8reMaTAJ:www.folkcorp.co.uk/classifieds/index.php+v4-team+hackers&cd=10&hl=en&ct=clnk&gl=us Threat Name: HTTP MS MPEG2TuneRequestControl ActiveX BO 2 Location: [login to view URL]:KIxN0c5zl8QJ:www.renataparis.com/en/index_en.htm+renata+fashion+designer&cd=2&hl=en&ct=clnk&gl=us Threat Name: MSIE [login to view URL] Object File Installation Weakness Location: [login to view URL]:UMcksge4KWMJ:www.vierlander-vermogensbeheer.nl/pagina/werkwijze_uwadviseur/index.html+vierlander+effecten&hl=nl&gl=nl&strip=0 Threat Name: HTTP Malicious Toolkit Variant Activity Location: [login to view URL]:SzxHSwmwk78J:lexcompany.com/+Lex+Company&hl=en&gl=us&strip=0 Threat Name: HTTP Malicious Toolkit Variant Activity Location: [login to view URL]:SzxHSwmwk78J:lexcompany.com/+Lex+Company&cd=2&hl=en&ct=clnk&gl=us Threat Name: Direct link to HTTP Malicious Toolkit Variant Activity Location: [login to view URL]:SzxHSwmwk78J:lexcompany.com/+Lex+Company&hl=en&gl=us&strip=1 Threat Name: Direct link to HTTP MS Unsafe ActiveX Obj Instantiation Location: [login to view URL]:uxHa8reMaTAJ:www.folkcorp.co.uk/classifieds/index.php+v4-team+hackers&hl=en&gl=us&strip=1 Threat Name: Direct link to MSIE [login to view URL] Object File Installation Weakness Location: [login to view URL]:UMcksge4KWMJ:www.vierlander-vermogensbeheer.nl/pagina/werkwijze_uwadviseur/index.html+vierlander+effecten&hl=nl&gl=nl&strip=1