Error – Message- Need help fast..

I am receiving the following message:
ERROR STARTING PROGRAM (Appears in Title Bar) The message reads: (The ole 32.DLL File is linked to missing export RPCRT4.DLL:1_RpcAsyncSendReceive) This occurs when we are installing software and I get to thepoint “Start Setup”. We can’t get it to go any further. Reloaded Win94a w/o help. Can someone tell me why and step by step to correct the problem. Machine works fine otherwise. I need to resolve pretty fast. Thanks!