diff --git a/reactos/subsys/system/usetup/bootsup.c b/reactos/subsys/system/usetup/bootsup.c
index 0e654f4f98f..309b3ae9a57 100644
--- a/reactos/subsys/system/usetup/bootsup.c
+++ b/reactos/subsys/system/usetup/bootsup.c
@@ -371,7 +371,7 @@ CreateFreeLoaderIniForReactos(PWCHAR IniPath,
 		    NULL,
 		    INSERT_LAST,
 		    L"Options",
-		    L"/DEBUGPORT=COM1 /NOGUIBOOT");
+		    L"/DEBUGPORT=SCREEN /NOGUIBOOT");
 
   /* Save the ini file */
   IniCacheSave(IniCache, IniPath);
@@ -1134,15 +1134,19 @@ InstallMbrBootCodeToDisk (PWSTR SrcPath,
 			     NULL,
 			     NULL);
 
-  Status = NtOpenFile(&FileHandle,
-		      FILE_WRITE_ACCESS | FILE_WRITE_ATTRIBUTES,
-		      &ObjectAttributes,
-		      &IoStatusBlock,
-		      0,
-		      FILE_SYNCHRONOUS_IO_NONALERT | FILE_SEQUENTIAL_ONLY);
+  Status = NtCreateFile(&FileHandle,
+			FILE_WRITE_ACCESS,
+			&ObjectAttributes,
+			&IoStatusBlock,
+			NULL,
+			FILE_ATTRIBUTE_NORMAL,
+			0,
+			FILE_OVERWRITE_IF,
+			FILE_SYNCHRONOUS_IO_NONALERT | FILE_SEQUENTIAL_ONLY,
+			NULL,
+			0);
   if (!NT_SUCCESS(Status))
   {
-    DPRINT1("NtOpenFile() failed (Status %lx)\n", Status);
     RtlFreeHeap(ProcessHeap, 0, NewBootSector);
     return(Status);
   }
@@ -1291,15 +1295,19 @@ InstallFat16BootCodeToDisk(PWSTR SrcPath,
 			     NULL,
 			     NULL);
 
-  Status = NtOpenFile(&FileHandle,
-		      FILE_WRITE_ACCESS | FILE_WRITE_ATTRIBUTES,
-		      &ObjectAttributes,
-		      &IoStatusBlock,
-		      0,
-		      FILE_SYNCHRONOUS_IO_NONALERT | FILE_SEQUENTIAL_ONLY);
+  Status = NtCreateFile(&FileHandle,
+			FILE_WRITE_ACCESS,
+			&ObjectAttributes,
+			&IoStatusBlock,
+			NULL,
+			FILE_ATTRIBUTE_NORMAL,
+			0,
+			FILE_OVERWRITE_IF,
+			FILE_SYNCHRONOUS_IO_NONALERT | FILE_SEQUENTIAL_ONLY,
+			NULL,
+			0);
   if (!NT_SUCCESS(Status))
   {
-    DPRINT1("NtOpenFile() failed (Status %lx)\n", Status);
     RtlFreeHeap(ProcessHeap, 0, NewBootSector);
     return(Status);
   }
@@ -2072,7 +2080,7 @@ InstallFatBootcodeToFloppy(PUNICODE_STRING SourceRootPath,
   wcscpy(SrcPath, SourceRootPath->Buffer);
   wcscat(SrcPath, L"\\loader\\freeldr.sys");
 
-  wcscpy(DstPath, L"\\Device\\Floppy0\\freeldr.sys");
+  wcscat(DstPath, L"\\Device\\Floppy0\\freeldr.sys");
 
   DPRINT("Copy: %S ==> %S\n", SrcPath, DstPath);
   Status = SetupCopyFile(SrcPath, DstPath);
@@ -2083,7 +2091,7 @@ InstallFatBootcodeToFloppy(PUNICODE_STRING SourceRootPath,
     }
 
   /* Create new 'freeldr.ini' */
-  wcscpy(DstPath, L"\\Device\\Floppy0\\freeldr.ini");
+  wcscat(DstPath, L"\\Device\\Floppy0\\freeldr.ini");
 
   DPRINT("Create new 'freeldr.ini'\n");
   Status = CreateFreeLoaderIniForReactos(DstPath,
@@ -2098,7 +2106,7 @@ InstallFatBootcodeToFloppy(PUNICODE_STRING SourceRootPath,
   wcscpy(SrcPath, SourceRootPath->Buffer);
   wcscat(SrcPath, L"\\loader\\fat.bin");
 
-  wcscpy(DstPath, L"\\Device\\Floppy0");
+  wcscat(DstPath, L"\\Device\\Floppy0");
 
   DPRINT("Install FAT bootcode: %S ==> %S\n", SrcPath, DstPath);
   Status = InstallFat16BootCodeToDisk(SrcPath,