Dumb question coming from a Comptia A plus I wonder do I need add more ram to my laptop?

I know more RAM is always better. But what is the point when you reach to a point extra is waste of money or something like that. I am thinking adding 8 GB ram but at the same time I am tight on cash but I been thinking about adding more ram for a while.

Here are the information you need and I am using 80% Physical Memory or 2.20 GB out of 3 GB:

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SYSTEM SUMMARY

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Windows 7 Home Premium Edition Service Pack 1 build 7601 (64-bit),

1 x AMD Athlon(tm) II P320 Dual-Core Processor [2095.0 MHz],

2.7GB RAM,

AMD M880G with ATI Mobility Radeon HD 4250,

233GB HDD,

CD-RW/DVDRW,

GENERAL

System Name: MICHAELBAUERMEI

System Model: Presario CQ62 Notebook PC

Motherboard Manufacturer: Hewlett-Packard

Motherboard Name: 1444

Motherboard Version: 69.26

Motherboard Serial Number: CNFO175VFH

BIOS Manufacturer: Hewlett-Packard

BIOS Version: F.17

BIOS Release Date: 11/07/2010

CPU

CPU manufacturer: AuthenticAMD

CPU Type: AMD Athlon(tm) II P320 Dual-Core Processor

CPUID: Family 10, Model 6, Stepping 3, Revision DA-C3

Physical CPU's: 1

Cores per CPU: 2

Hyperthreading: Not capable

CPU features: MMX 3DNow! SSE SSE2 SSE3 SSE4a DEP PAE AMD64

Clock frequencies:

Measured CPU speed: 2095.0 MHz

Cache per CPU package:

L1 Instruction Cache: 2 x 64 KB

L1 Data Cache: 2 x 64 KB

L2 Cache: 2 x 512 KB

MEMORY

Total Physical Memory: 2811MB

Available Physical Memory: 542MB

Memory devices:

0:

- 2048MB, 1066MHz,

1:

- 1024MB, 1066MHz,

Virtual memory: C:\pagefile.sys (allocated base size 2810MB)

GRAPHICS

AMD M880G with ATI Mobility Radeon HD 4250

Chip Type: ATI display adapter (0x9712)

DAC Type: Internal DAC(400MHz)

Memory: 256MB

BIOS: BK-ATI VER010.094.001.045.035812

Driver provider: ATI Technologies Inc.

Driver version: 8.770.2.1000

Driver date: 9-19-2010

Monitor 1: 1366x768x32 60Hz (Primary monitor)

DISK VOLUMES

C: Local drive, NTFS, (218.99GB total, 139.98GB free)

D: Local drive, RECOVERY, NTFS, (13.70GB total, 12.80GB free)

E: Optical drive, CDDVDW TS-L633N

DISK DRIVES

Disk drive: Model Hitachi HTS542525K9SA00 SATA Disk Device (Size: 232.89GB)

OPTICAL DRIVES

E: hp CDDVDW TS-L633N (CD-RW/DVDRW)

NETWORK

Realtek PCIe FE Family Controller (Speed: 100Mb/s)

Atheros AR9285 802.11b/g/n WiFi Adapter (Speed: 90Mb/s)

PORTS

Standard OpenHCD USB Host Controller

Standard Enhanced PCI to USB Host Controller

Standard OpenHCD USB Host Controller

Standard Enhanced PCI to USB Host Controller

- (SN: B53A2680)

Standard OpenHCD USB Host Controller

Standard OpenHCD USB Host Controller

Standard Enhanced PCI to USB Host Controller