I have win 7 64 bits. There is no known compatability issue, but it can be a bit finicky with certain games. You might try a total reinstal to see if that helps.
I restarted playing a few weeks back on a year old instal of RFB+RSRDC and was getting pretty constant CTDs whenever near enemy ships. After trying various tricks, I reinstalled SH4+UBM from scratch, installed TMO2.5+RSRDC and have not had one CTD in 5-6 hours of play.
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