How to Install Windows 7 From USB Drive without Windows 7 ISO DVDWe have published article on How to install Windows 7 on Vmware Player. That guide is useful if you want to make yourself free from need of dual boot. Now here is another scenario what if you dont have DVD ROM and you are running Windows XP, you might have guessed in this case we cant install windows 7. MBRwiz Download and Extract it on your hard drive Diskpart utility for Windows XP doesnt detect USB drive as Disk hence we need to use this free utility to make. Usage Statistics for communitygaze. com Summary Period May 2016 Search String Generated 08Oct2017 0208 PDT. Since. Windows 7 ISO size is around 2. GB so its obvious that you will need to burn windows 7 iso on DVD and another issue is you cant start windows 7 installation by mounting ISO file on windows XP as Windows XP upgrade to windows 7 is not allowed. In such situation installing windows 7 from USB pen drive is feasible solution. Here is small guide on how to install windows 7 from USB flash drive or USB pen Drive for Windows XP users. How to Install Windows 7 from USB Flash Drive. Requirement USB Pen Drive Min 4 GBWindows 7 ISO 3. MBRwiz. Download and Extract it on your hard drive Diskpart utility for Windows XP doesnt detect USB drive as Disk hence we need to use this free utility to make bootable USB drive. Connect your USB Flash Drive to your computer Format USB drive. To Format USB Flash Drive Go to My Computer Right click on USB drive and select Format from context menu. Now go to Start Menu run cmd Open Command Prompt and Type following commandconvert i fs ntfsWhere I is your USB drive latter4. Mount Windows 7 iso as drive You can use Freeware Magic. Disc download from here. Type Start run cmd. Now dir to directory where you have extracted MBRWiz and run following commandsmbrwiz list note down disk number of your USB Pen drivembrwiz diskX activeX X is Disk Number of your USB Driveexit. Now open another command window and type following command. J Drive letter of Windows 7 iso mounted with demon toolCD bootbootsect nt. Y Y is drive latter of your USB drive 7. Now copy all files from drive where you have mount Windows 7 iso. Now reboot your computer and press F9 to get your BIOS screen and select USB drive as your boot drive. If every thing goes fine, Your Windows 7 Installation should start from your USB drive. Dell optiplex 9. 90 1 3 on Components. According to your service manual found hereftp ftp. Manualsall productsesuprtdesktopesuprtoptiplexdesktopoptiplex 9. Service2. 0Manual. Ensure that no special requirements for memory moduleconnector placement exist. Ensure that the memory you are using is supported by your computer. Nothing more. I might suggest ensuring the ram is fully seated in its slots.