i need some help from you out there. i am a filipino. i have to share with you my problem regarding autocadd 2008, i am a beginner for 3d cadd application. this happens when i am about to render the 3 storey building w/ basement. the window suddenly hangs-up or "not responding" and i cannot maneuver anymore except while it is in the 2d mode. my PC specs are to wit:
processor intel core 2 dou. E4500@2.2Ghz, 2039MB, built-in graphic cards.
OS Name Microsoft® Windows Vista™ UltimateVersion 6.0.6000 Build 6000Other OS Description  Not AvailableOS Manufacturer Microsoft CorporationSystem Name BERNIE-PCSystem Manufacturer Gigabyte Technology Co., Ltd.System Model 945GCM-S2CSystem Type X86-based PCProcessor Intel(R) Core(TM)2 Duo CPU     E4500  @ 2.20GHz, 2200 Mhz, 2 Core(s), 2 Logical Processor(s)BIOS Version/Date Award Software International, Inc. F4, 11/8/2007SMBIOS Version 2.4Windows Directory C:\WindowsSystem Directory C:\Windows\system32Boot Device \Device\HarddiskVolume2Locale Republic of the PhilippinesHardware Abstraction Layer Version = "6.0.6000.16386"User Name bernie-PC\bernieTime Zone Arab Standard TimeTotal Physical Memory 2,038.94 MBAvailable Physical Memory 786.81 MBTotal Virtual Memory 4.20 GBAvailable Virtual Memory 1.97 GBPage File Space 2.28 GBPage File C:\pagefile.sysName Intel(R) 82945G Express Chipset FamilyPNP Device ID PCI\VEN_8086&DEV_2772&SUBSYS_D0001458&REV_02\3&13C0B0C5&1&10Adapter Type Intel(R) 82945G Express Chipset Family, Intel Corporation compatibleAdapter Description Intel(R) 82945G Express Chipset FamilyAdapter RAM 256.00 MB (268,435,456 bytes)Installed Drivers igdumd32.dllDriver Version Not AvailableINF File oem6.inf (i945G0 section)Color Planes Not AvailableColor Table Entries 4294967296Resolution 1280 x 1024 x 60 hertzBits/Pixel 32Memory Address 0xE2100000-0xE217FFFFI/O Port 0x0000C000-0x0000C007Memory Address 0xD0000000-0xDFFFFFFFMemory Address 0xE2180000-0xE21BFFFFIRQ Channel IRQ 16I/O Port 0x000003B0-0x000003BBI/O Port 0x000003C0-0x000003DFMemory Address 0xA0000-0xBFFFFDriver c:\windows\system32\drivers\igdkmd32.sys (7.14.10.1437, 2.20 MB (2,302,976 bytes), 2/11/2008 7:36 PM)

You may want to check out the performance tuner. '3dconfig' is the command prompt entry, or in the options>System tab. If you select the 'View Tune Log' and post that, maybe it will tell us something. On-board graphics can be an issue when you are rendering. But I don't know for sure that it's the issue. Post the log and we'll go from there.