[R] R Premanently Occupy Server Memory

[Suphajak Ngamlak]

Could anyone please point me to the location of the temp memory that R occupy in Window Server 2008 R2? 
After we finished running many R codes, our server memory (C: drive) become full and currently our only solution is to restart server. 
We would really appreciate if anyone can suggest how we can clear the occupied memory without restarting.


Best Regards, 
Suphajak Ngamlak