I have never heard of such problem before. Can you try the latest version? If it does not help, you may try some old version (at least several months). You may also download standalone executable, WinSCP does not need to be installed at all for most of its functions to work.
Immediately upon running winscp361setup.exe I receive a "Access violation at address 00000000. Read of address 00000000" error. I have tried disabling all services and av software and installing under multiple profiles including local admin but still receive the same error. Any suggestions would be appreciated.