RAM not detecting in multiple programs.

Pls tell the complete details of your system including the memory of your gpu or other connected devices.

Your graphics card could be eating up some of your memory.

Processor Information:
Vendor: GenuineIntel
Speed: 1799 Mhz
2 logical processors
2 physical processors
HyperThreading: Unsupported
FCMOV: Supported
SSE2: Supported
SSE3: Supported
SSSE3: Supported
SSE4a: Unsupported
SSE41: Unsupported
SSE42: Unsupported

Network Information:
Network Speed: DSL > 256k

Operating System Version:
Windows Vista (32 bit)
NTFS: Supported
Crypto Provider Codes: Supported 323 0x0 0x0 0x0

Video Card:
Driver: NVIDIA GeForce GTS 250
DirectX Driver Name: nvd3dum.dll
Driver Version: 8.17.11.9745
DirectX Driver Version: 8.17.11.9745
Driver Date: 3 Apr 2010
Desktop Color Depth: 32 bits per pixel
Monitor Refresh Rate: 60 Hz
DirectX Card: NVIDIA GeForce GTS 250
VendorID: 0x10de
DeviceID: 0x615
Number of Monitors: 1
Number of Logical Video Cards: 1
No SLI or Crossfire Detected
Primary Display Resolution: 1280 x 1024
Desktop Resolution: 1280 x 1024
Primary Display Size: 17.80" x 14.21" (22.76" diag)
45.2cm x 36.1cm (57.8cm diag)
Primary Bus: PCI Express 16x
Primary VRAM: 1024 MB
Supported MSAA Modes: 2x 4x 8x


Sound card:
Audio device: Speakers (2- SigmaTel High Defi

Memory:
RAM: 1022 Mb IT SHOULD BE 3

Miscellaneous:
UI Language: English
Microphone: Yes, I have a microphone.
Media Type: DVD
Total Hard Disk Space Available: 305244 Mb
Largest Free Hard Disk Block: 40357 Mb
Steam Hard Disk Usage: 87067 Mb
OS Install Date: Dec 21 2006

Wow too much of information.
Since your os is 32bit,might be this is happening.

Quote from tech forum:
32 Bit OS can not and will not recognize or utilize 4GB of RAM. The Max you will get is 3.5GB of RAM recognized and utilized on a 32 Bit system.
Registers in x86 PCs are limited to 32 bits, which means the biggest number that can be stored in that register is 2^32, or 4,294,967,296;
which means that the CPU can access up to "ADDRESS 4,294,967,296" which is the 4th GB of data.
The problem is that the CPU also access I/O devices (printer, USB, keyboard, mouse, monitor, etc.) by assigning them an address as well.
So it reserves half a GB or so of the memory addresses to talk to the I/O devices... So you have 4GB - ~0.5GB -> 3.5 GB (on Windows it is 3.2GB).
Plus this also doesnt take into consideration that Video Card Memory which is also added into the resources.

So lets calculate:
your vista can see but cannot use.

3 GB-.5 GB(by OS)=2.5 GB.
2.5 GB-1 GB(VRAM)=1.5 GB.

This is reasonable.Might be there are some other resources connected to your pc which use up your ram.