When i am doing right click database >> Task >> restore >>database. I am getting below error

"Exception of type 'system.outofmemoryexception' was thrown"

Server configuration :

32 GB RAM

64 bit O/S

2 processors

Intel(R) Xeon(R) E5620 @2.40GHZ

service pack 2

SQL server 2008R2 (Standard Edition)

Note: In that server over all 850 databases which around 120 GB. And log shipping configured around 750 databases.

Error screenshot attached for ref.

thanks,