Computer is still slow, tried everything

Ok from what I see from your task manager windows is that you have 80+ processes running did you try to turn off all the process that you don't need (don't touch anything Microsoft) and see if that speed up your pc.
 

My Computer My Computer

Computer Manufacturer/Model Number
Custom
OS
Windows 7 pro x64
CPU
Intel Core i5 750 @ 3.3 GHz
Motherboard
Evga P55 Sli
Memory
G.SKILL 8GB (4 x 2GB) 240-Pin DDR3 @ 1600
Graphics Card(s)
EVGA GeForce GTX 260 And EVGA GeForce GTX 9800+
Sound Card
EarForce PX21
Monitor(s) Displays
ASUS VH222H Black 21.5"
Screen Resolution
1920x1080
Hard Drives
320Gb Sata
150Gb Sata
3 tb External
PSU
COOLER MASTER Silent Pro 600W
Case
Antec Nine Hundred
Cooling
ZALMAN CNPS9900ALED 120mm
Keyboard
Logitech G15
Mouse
Logitech G5
Internet Speed
21ish Mbps
Ok from what I see from your task manager windows is that you have 80+ processes running did you try to turn off all the process that you don't need (don't touch anything Microsoft) and see if that speed up your pc.

I did try turning off as many as I could in startup (Dropbox, Skype, etc) but nothing really changed. There are three different user accounts on the computer and they're often all logged in, that's why there's a bunch. Do I need more RAM, maybe? I notice IE alone can take up ~180,000 KB of ram, and with multiple accounts running multiple windows of IE it tends to add up pretty fast.
 

My Computer My Computer

Computer Manufacturer/Model Number
Custom
OS
Windows 7 Professional x64
CPU
Intel i5 750
Motherboard
MSI P55-GD65
Memory
4 GB DDR3 1333
Graphics Card(s)
ATI x1950 Pro
Hard Drives
500 GB Western Digital Caviar Blue
PSU
500 watt Thermaltake
Sure thing. I went ahead and turned on AHCI, computer does seem a little faster.

Glad to see you received some performance boost. Is Windows stable so far?

So far it is stable, but it's actually not a lot faster. I'm thinking I'll read the rest of that optimization list later.

Do I need to install any drivers to optimize SATA/AHCI? I've been wondering about that. Also, I'm never sure if of how I should ever update my mobo's chipset/SATA drivers. Would I do it from the motherboard manufacturer's website, or from the chipset's website? Or is it not necessary to update SATA/chipset drivers?
 

My Computer My Computer

Computer Manufacturer/Model Number
Custom
OS
Windows 7 Professional x64
CPU
Intel i5 750
Motherboard
MSI P55-GD65
Memory
4 GB DDR3 1333
Graphics Card(s)
ATI x1950 Pro
Hard Drives
500 GB Western Digital Caviar Blue
PSU
500 watt Thermaltake
I would check the motherboard's site first. If the drivers are outdated by more than six months, check the chipset's website. This assumes that your motherboard provides such updates, which I think MSI does from prior experience with that manufacturer.

I do not think you need more memory; I don't think you would see that drastic of a performance change from that based on only 65% of it being used. You can end processes in task manager that are only for your user, but avoid any that say SYSTEM or anything else. I assume Brad is your username? End processes that say Brad if you know you are not using that software.
 

My Computer My Computer

Computer Manufacturer/Model Number
HP Pavilion e9110t
OS
Windows 7 Home Premium 64 Bit
CPU
Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.83GHz
Motherboard
Pegatron IPIEL-LA3
Memory
6.00 GB Hundai HMT125U6BFR8C-H9
Graphics Card(s)
ATI Radeon HD 4850
Sound Card
Realtek High Definition Audio/ATI High Definition Audio
Monitor(s) Displays
Acer AL2216W
Screen Resolution
1680x1050
Hard Drives
Hitachi HDP725050GLA360 ATA Device 500 GB
PSU
Unknown/installed by HP
Case
HP generic case
Cooling
Intel Stock Cooling
Keyboard
HP Keyboard
Mouse
HP Mouse
Internet Speed
Download: 19.15 Mbps Upload: 1.67 Mbps
Other Info
Network Adapter Realtek RTL8168D/8111D Family PCI-E Gigabit Ethernet NIC (NDIS 6.20)
Network Adapter 802.11n Wireless PCI Express Card LAN Adapter
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