You can always try the microsoft solution -
Error: "C_1252.nls File Missing or Corrupt" During Startup
If you don't have a windows cd then about your only option is the first one in the article. Otherwise you may need to copy it over from another system, not sure if that will work though. Post back your results and I could always copy the file from an XP cd and post it on a hosting site. Then you could use something like Hiren's Boot cd or Bart PE and expand that file from whatever media you put it on.