We use both of these programs with Vista and XP. We highly recommend them.
You can try them at No Cost
Repair XP Pro 100% XP & Vista Compatible
(Great program) The most comprehensive system repair tools on the market.
 

Error: "C_1252.nls File Missing or Corrupt" During Startup
or
The file C:\windows\system32\c_1252.nls is missing or corrupt
When you try to start your Microsoft Windows XP-based computer, you may receive an error message that is similar to the above error message:
See:  http://support.microsoft.com/default.aspx?scid=kb;en-us;830088&Product=winxp

* The hottest Registry cleaning software on the Net today!

* Repair XP Pro - (Great program) The most comprehensive system repair tool on the market.

* 100's of Very Good Assorted Free computer programs.