[xwiki-users] java heap out of memory error during import of 72MB XAR file?

I have XAR file of 72MB . When i Import it thru XWI UI i get java heap out of memory error. I have mentioened the value of JAVA_OPTS as -Xms1024m -Xmx1024m. My hardware specification is 32 bit windows operating system and 4 GB RAM. and using the tomcat as webserver. If i increase the value of JAVA_OPTS to -Xms1536m -Xmx1536m, tomcat does not even start(Probably reason is 32 bit operating system and 4 GB RAM). I can not increase change the server configuration somehow.How should i go about resolving this issue? The only thing i can take help for now is do all the set up stuff on 8GB machine and do restore of database on 4GB machine. But again i am worried with some repurcussion of this approach i.e if there is a deltion/rename of some column etc , on new xwiki version an. then it will be hard time for me to restore the databse. Looking for quick response. i am sure you guys also must had faced this issue in past. Kindly share your experiences For your information same xar file gets imported on 64 bit operating system and 8GB RAM but how should i successfully resolve import of 72MB XAR file on 32 bit OS and 4 GB RAM? i can not upgrade this client machine due to some restrictions.