The spldr.sys should be there.
Please start the command prompt (cmd.exe) with admin rights [1] and run sfc [2]:
sfc.exe /scannow
Is it able to find and repair broken/missing files? If not, replace the driver with the file from your DVD [3].
best regards
André
[2] http://support.microsoft.com/kb/929833
"A programmer is just a tool which converts caffeine into code" CLIP- Stellvertreter http://www.winvistaside.de/