I just installed windows 7 ultimate os on my 4920g..but after it's already installed the memory of ram become 1 gb it must be 3 gb of ram (additional 2 gb of ram already installed before replace os to windows 7)

You need to upgrad the amount of RAM.
The 4720 notebook is capable of running up to 4GB or ram on 32bit windows 7 OS

The OS requires 1GB of RAM to run.....

Therefore, you only have enough RAM to run window, and no spare ram that should be dedicated to the graphics and other system operations.

Action needed:
Buy 2x 2GB sticks of Kingston ValueRam and run the laptop on 4GB. It will be much faster than what is needed and should provide fast computer responce.

Cheers.

Well there is no problem from upgrading the (OS) to windows 7 ultimate . because your laptop resources are not low.
regrading for the video driver issue .Download the drivers for windows 32 from
http://us.acer.com/ac/en/US/content/support

Did you try a System Restore/recovery? Unplug, remove battery, plug in, reboot . Use this procedure to restore to a date before the updates, Did you get the Updates from Toshiba website? https://www.csd.toshiba.com/cgi-bin/tais/support/jsp/bulletinDetail.jsp?soid=2737864&pf=true The specs show that machine had Windows Vista originally. Do you have a Windows 7 Repair disk? For a disk try here: http://www.lifehacker.com.au/2011/08/download-windows-7-isos-to-reinstall-without-restoring-your-system/ OR here: http://www.mydigitallife.info/windows-7-iso-x86-and-x64-official-direct-download-links-ultimate-professional-and-home-premium/

Hi Trifon,
you are detecting a known problem for 32 bit operating systems.
The problem for those system is that they can manage maximum 3 Gb of RAM.
If you want all of your RAM used you have to install a 64 bit operating system. Windows 7 has also a version for 64 bit as well as windows xp (but is not good supported) and windows vista.

windows 7 os requires atleast 16GB avilable space while windows vista requires atleast 15gb. It could be true that your system requirements are not sufficient for the new os you want to install
If you want to run Windows 7 on your PC, here's what it takes:

• 1 gigahertz (GHz) or faster 32-bit (x86) or 64-bit (x64) processor
  

• 1 gigabyte (GB) RAM (32-bit) or 2 GB RAM (64-bit)
  

• 16 GB available hard disk space (32-bit) or 20 GB (64-bit)
  

• DirectX 9 graphics device with WDDM 1.0 or higher driver
  

• DVD-ROM drive

If you want to run Windows Vista on your PC, here's what it takes:

• 1 gigahertz (GHz) 32-bit (x86) or 64-bit (x64) processor
  

• 1 gigabyte (GB) of system memory (512 megabytes (MB) for Home Basic)
  

• 40 GB hard drive with at least 15 GB of available space (20 GB for Home Basic)
  

• Support for DirectX 9 graphics with WDDM and 128 MB of graphics memory (32 MB for Home Basic)
  

• DVD-ROM drive
  

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f you want to run Windows 7 on your PC, here's what it takes:

• 1 gigahertz (GHz) or faster 32-bit (x86) or 64-bit (x64) processor
  

• 1 gigabyte (GB) RAM (32-bit) or 2 GB RAM (64-bit)
  

• 16 GB available hard disk space (32-bit) or 20 GB (64-bit)
  

• DirectX 9 graphics device with WDDM 1.0 or higher driver
  

  So if your Acer TM4150 meets this minimum requirements, then you can install the windows 7 OS
  

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Regards
Uttam
Windows 7 requirement If you want to run Windows 7 on your PC, here's what it takes:

• 1 gigahertz (GHz) or faster 32-bit (x86) or 64-bit (x64) processor
• 1 gigabyte (GB) RAM (32-bit) or 2 GB RAM (64-bit)
• 16 GB available hard disk space (32-bit) or 20 GB (64-bit)
• DirectX 9 graphics device with WDDM 1.0 or higher driver

http://www.microsoft.com/windows/windows-7/get/system-requirements.aspx

Here is you laptop spec
Processor Processor Intel Pentium M 733 / 1.1 GHz

• Core voltage technology Ultra Low Voltage (ULV)
• Data bus speed 400.0 MHz
• Processor features Enhanced SpeedStep technology , Power-optimized processor system bus
• Chipset type Intel 855GME

Cache Memory Type L2 cache

• Cache size 2.0 MB

RAM Installed Size 512.0 MB / 2.0 GB (max)

• Technology DDR SDRAM - 333.0 MHz
• Memory specification compliance PC2700

Video Graphics Processor / Vendor Intel Extreme Graphics 2

• Video Memory Dynamic Video Memory Technology 2.0

Operating System / Software

• OS Provided Microsoft Windows XP Professional
• Software Drivers & Utilities

Well, you need more RAM. 1 GB is not enough for Vista Ultimate. Contact Dell to upgrade and add a 2 GB memory module for a total of 3 GB. Apparently, you have 30 GB disk full with the Vista OS and software programs. At some point, I'd like to see you extend your partition for your 160 GB drive so that "C" is much larger than 40 GB. You'll need one-one assistance via FixYa.

If yours is a PC, Windows Vsita 64 bit should recognize 4 GB RAM. Have you tried the 64 bit bootable linux? Try with that. If you see less than 4GB, then you must check your BIOS for some setting which is the setting to share to the graphics memory or some limit.

it sounds as if your MoBo is seeing the video adapter as a source of ram. if that is the case, then installing memory in units of 1Gb will cause a stick to not be seen, therefore utilized. you may want to refer to you manual for memory limits and poosible comparibility issues. they are usually quite in depth. also, make sure that they are all the same make model and speed. these issues have wreaked havoc on the prettiest of pc's.