Okay.... so do you at least have the cab files from the OS?? Either on the hdd or the orignal CD.... You need to use EXTRACT to get the needed file out of the cab file. Since if looks like you have at least a second computer, the current PKZIp for windows (shareware) will also decompress cab files. It will even show you the contents of the cab if you need to search it out...
Don't know how to use EXTRACT??? Go to Microsoft's Knowledgebase and seach for it.... Can't hold your hand all the way...