Hi, don't know if you fixed this yet. The post was 2 days ago and no one has yet posted an answer. Anyway, Mac OS X can not "write" on Windows partitions (only NTFS; FAT32 is fine). Which means you won't be able to delete that file. You'll have to download
MacFUSE and the
NTFS plugin. After installing both of these, you should be able to delete the file.
Now, on a second note, I highly doubt "deleting" that file will fix that problem. It's a system file which means after you delete the file, you'll probably get "Windows can not fine stpd.sys." I recommend using the Windows CD/DVD and running repair on it. For Windows Vista/7, just pop in the DVD and run "repair system" I believe. For Windows XP, you'll need to follow these instructions
here.
Good luck!