I'd advise treating your symptoms as an indication of your computer starving for RAM.
IOW, close down all your extra networking apps. ( such as AuroraNet ) that might be monopolizing RAM usage.
If that doesn't help then Un-Install REW and then reinstall, while choosing the smallest RAM footprint ( choice ) within the REW install sequence of windows
Alternately, one can have both the 32bit + 64bit versions co-existing on the same 64bit machine.
- Using the 32bit version of REW "might" offer a lower RAM footprint.