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Sir, You may be using a 32-bit version of Java possibly on a 64-bit machine though I cannot be sure because you did not supply much information. First, determine if your machine is 32-bit or 64-bit: https://esupport.trendmicro.com/en-us/home/pages/technical-support/1038680.aspx Next make sure you download the correct version of the IDV http://www.unidata.ucar.edu/downloads/idv/current/index.jsp ------------------------------------------------------------------------ computer architecture Version of the IDV ------------------------------------------------------------------------ 32-bit IDV 5.2 Installer for Windows XP/Vista/7 64-bit IDV 5.2 Installer for 64-bit Windows XP/Vista/7 ------------------------------------------------------------------------ Once you have downloaded the IDV it should be sufficient to start the IDV via the IDV icon. However, it appears you are starting the IDV from the Windows command prompt ,---- | jre\bin\java -Xmx1536m -XX:+DisableExplicitGC -Didv.enableStereo=false -jar idv.jar `---- If you choose to do that and you are on a 32 bit machine `-Xmx1536m' is too much and you will have to supply a smaller number (e.g., `-Xmx1200m'). (Java cannot use the entire memory capacity available on your computer, or else it will fail to start, possibly in the manner you describe.) Best, Unidata IV Support > > > Hi, > > > An error messenage occurred when I try to run idv: > > > > > > "D:IDV_5.2>jre\bin\java -Xmx1536m -XX:+DisableExplicitGC > > > -Didv.enableStereo= > > > > > > false -jar idv.jar > > > > > > Error occurred during initialization of VM > > > Could not reserve enough space 1572864KB for object heap" > > > > > > However,I have 7.89GB RAM and it worked yesterday.I already uninstall > > > and reinatall again and also reboot computer but error still exits. > > > > > > > > Hi there, > > > > Please delete the .unidata folder and test your IDV again. The problem is > > that you were trying to run the IDV with 15G memory and your computer only > > has 8G memory. > > > > > > Yuan > Sorry I read the number incorrectly. However, deleting or renaming the > .unidata folder should help. > > Yuan Ticket Details =================== Ticket ID: JKN-535702 Department: Support IDV Priority: Normal Status: Closed