Sudden decrease in Dedicated Video Memory

Earlier, I was trying to boost the performance of my PC and tried things out. At first, based on what I remember, my Dedicated Video Memory was around 1000+ (not sure about the exact value) while the Total Ram on Windows Task Manager was 7886. As I was trying things out, I have to use system restore because I have uninstalled some files and needed to revert that action. After the restore, I noticed that my Dedicated Video Memory became 256mb! while my Total Ram is still at 7886. I tried to fix it by settings things at default in the BIOS settings but it doesn't work. I tried to increase my Dedicated Video Memory by allotting 1026?mb of my ram but with that option, it reduced my ram. I wanna revert back to the old settings where my Dedicated Video Memory was around 1000+mb and w/ Total Ram of 7886.

Thanks

Operating System: Windows 7 Ultimate 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.150202-1526)
Language: English (Regional Setting: English)
System Manufacturer: System manufacturer
System Model: System Product Name
BIOS: BIOS Date: 10/08/12 14:59:47 Ver: 08.02
Processor: Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz (8 CPUs), ~3.4GHz
Memory: 8192MB RAM
Available OS Memory: 7886MB RAM
Page File: 3770MB used, 11999MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7601.17514 64bit Unicode

---------------
Display Devices
---------------
Card name: Intel(R) HD Graphics 4000
Manufacturer: Intel Corporation
Chip type: Intel(R) HD Graphics Family
DAC type: Internal
Device Key: Enum\PCI\VEN_8086&DEV_0162&SUBSYS_844D1043&REV_09
Display Memory: 1760 MB
Dedicated Memory: 256 MB
Shared Memory: 1504 MB
Current Mode: 1600 x 900 (32 bit) (60Hz)
Monitor Name: Acer P205H
Monitor Model: Acer P205H
Monitor Id: ACR00C5
Native Mode: 1600 x 900(p) (59.978Hz)
Output Type: HD15

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Try reverting your bios settings to default. If possible, avoid modifying the alloted video memory because windows will do it itself depending on how an application needs it.