Can I upgrade to Windows 8.1 64-bit with 2GB of Ram

Seeing that Microsoft has stop support for Windows XP, It's only a matter of time before Windows 7 is next.

I have 2 machines: a desktop and a laptop.
I want to upgrade them both.

LAPTOP (SONY Vaio VGN-NS110E)
Computer Brand Name: Sony VGN-NS110E
Operating System: Microsoft Windows 7 Ultimate Build 7600 (32-bit)
Processor: Intel Core 2 Duo T7250 (2000.0 MHz)
Motherboard: Sony VAIO (Intel GL40 (Cantiga-GL) + ICH9M (Base))
Memory: 2 GBytes (Dual-Channel)
Hard Drive: Hitachi HTS543216L9SA00 (152,627 MBytes (160 GB))
Optical Drive: Optiarc DVD RW AD-7560S (DVD+R DL)
Display Adapter: Intel GM45/47 Chipset - Integrated Graphics 0 [B3] [Sony]
Audio Adapter: Intel 82801IB ICH9 - High Definition Audio [A3]
Network Adapter: Marvell Yukon 88E8055 PCI-E Gigabit Ethernet Controller
Atheros AR928x Wireless Network Adapter

Processor
Processor 1 ID = 0
Number of cores 2 (max 2)
Number of threads 2 (max 2)
Name Intel Mobile Core 2 Duo T7250
Codename Merom
Specification Intel(R) Core(TM)2 Duo CPU T7250 @ 2.00GHz
Package (platform ID) Socket P (478) (0x7)
CPUID 6.F.D
Extended CPUID 6.F
Core Stepping M0
Technology 65 nm
Core Speed 1592.9 MHz
Multiplier x FSB 8.0 x 199.1 MHz
Rated Bus speed 796.4 MHz
Stock frequency 2000 MHz
Instructions sets MMX, SSE, SSE2, SSE3, SSSE3, EM64T, VT-x
L1 Data cache 2 x 32 KBytes, 8-way set associative, 64-byte line size
L1 Instruction cache 2 x 32 KBytes, 8-way set associative, 64-byte line size
L2 cache 2048 KBytes, 8-way set associative, 64-byte line size
FID/VID Control yes
FID range 6.0x - 10.0x
Max VID 1.175 V
# of P-States 0

Chipset
Northbridge Intel GL40 rev. 07
Southbridge Intel 82801IM (ICH9-M) rev. 03
Memory Type DDR2
Memory Size 2048 MBytes
Channels Dual, (Symmetric)
Memory Frequency 331.8 MHz (3:5)

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DESKTOP
Machine name: 7E3748E282CF425
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 3 (2600.xpsp_sp3_gdr.101209-1647)
Language: English (Regional Setting: English)
System Manufacturer: MSI
System Model: MS-7592
Processor: Intel(R) Pentium(R) 4 CPU 2.80GHz (2 CPUs)
Memory: 2014MB RAM
Page File: 484MB used, 2143MB available
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
DxDiag Version: 5.03.2600.5512 32bit Unicode

Display
Card name: Intel(R) G41 Express Chipset
Manufacturer: Intel Corporation
Chip type: Intel(R) 4 Series Express Chipset Family

Processor
Processor 1 ID = 0
Number of cores 1 (max 1)
Number of threads 2 (max 2)
Name Intel Pentium 4 521
Codename Prescott
Specification Intel(R) Pentium(R) 4 CPU 2.80GHz
Package (platform ID) Socket 775 LGA (0x4)
CPUID F.4.9
Extended CPUID F.4
Core Stepping G1
Technology 90 nm
Core Speed 2799.8 MHz
Multiplier x Bus Speed 14.0 x 200.0 MHz
Rated Bus speed 800.0 MHz
Stock frequency 2800 MHz
Instructions sets MMX, SSE, SSE2, SSE3, EM64T
L1 Data cache 16 KBytes, 8-way set associative, 64-byte line size
Trace cache 12 Kuops, 8-way set associative
L2 cache 1024 KBytes, 8-way set associative, 64-byte line size
FID/VID Control no

Chipset
Northbridge Intel G41 rev. A3
Southbridge Intel 82801GB (ICH7/R) rev. A1
Memory Type DDR3
Memory Size 2 GBytes
Channels Single
Memory Frequency 400.0 MHz (1:2)