PC slower after windows reinstall.

temps on the cpu/gpu? sure it not your hdd?

Since you just reinstall, you sure it is not running windows updates?
ran check disk on the hdd?

Sounds like a hardware issue, possibly bad memory or incorrect memory setup.

1. run Memtest86 www.memtest86.com (full pass or until errors)

2. update BIOS if newer exists (use Memtest first though, because if the error exists then goes away after BIOS update that's useful info)

3. verify memory sticks in the correct slots (may be #2 and #4 slots for two sticks but motherboard manual will tell you)

Other:
If you have a USB stick try burning a Linux distro such as Linux Mint, then boot to it and run from it (do not install it to your hard drive). In fact, unhook all DVD and HDD/SSD cables while testing Linux from the USB stick to remove potential issues.

Other:
HDD or Sata data cable can sometimes be an issue as well.

when you first turn on the system look at how much CPU usage your using at idle or if any very high memory processes are listed.

My computer idles 1% but I've heard of similar issues before.

This info may be relevant i'll try to do some research while u post the %'s and or processes.

Yes, i would check those % right after restart, with no browser or programs open. Make sure its a full restart not a log off and on too.

It does help a ton, i just posted about a similar problem myself, and worked out the solution found here.
http://www.tomshardware.com/answers/id-3055786/svchost-cpu-idle-starting-windows-loads.html

Here is the skinny version of what i said at the end when i fixed my problem.
[
So I found out the solution. Once i Cleared system logs through Event viewer, and disabled windows update service the problem was solved. But through further inspection 8% was logs and the rest was windows update. After choosing to never update, and disabling the service at startup. My idle is at 0% CPU.

To enter the event viewer type "eventvwr" in run no quotes. Click windows logs > right click on application click properties > click clear log > dialog prompts u to save and clear or just clear, if u analyze logs feel free to click save if not click clear > Click apply > Click Ok.

Repeat steps above starting from Right click on application, and just right click and follow steps for security, setup, and system.

Close event viewer.


To disable windows update type "services.msc" into run no quotes
Make sure your on "Extended" tab (located bottom left)
Find Windows Update Right click >properties >startup type dropdown > select disable >apply > okay

Open control panel > Upper right hand corner search type "Windows Update"
Select windows update in Green (may vary if themed)
Left hand side select "Change Settings"
Find "Important Updates" dropdown menu
Select Never check for updates.

******FOREWARNING////NOTE*******
All commands done through run are on Win 7 Pro.
Doing this will disable automatic updating. Which can stop your system from receiving Crucial Security updates. To update, you must manually search for updates preferably once a week (set a reminder!) through the windows update section within control panel. I highly recommend keeping your system up to date but I'll control when my computer dedicates resources for this updates. ]


Hope this helps

Not every time, but yes it did happen before I got the issue fixed.

Open up device manager do you see any icons with yellow triangles?

Click Start, Click Control Panel,
Look at the top of the window, in the path bar you see “control panel >”
Click on “>” (in the path bar) now click on “all control panel options.”
(This will open up all the hidden controls available)
Click Power Options
click on the arrow to “show other plans”
Check the Box that says "high performance"
Click (in high performance) "change plan settings"
Turn off display: set to NEVER
Put the computer to sleep: set to NEVER
Click: Change advanced plan settings
Scroll down the list: Click on the + signs to expand the choices for each item on the list.
Require a password on wake up: set to NO
Hard disk: turn off the hard disk: set to NEVER
Wireless adapter settings:
Sleep: set to NEVER
Allow Hybrid sleep: set to NEVER
Hibernate after: set to NEVER
Allow wake timers: set to disable
USB settings:
USB selective suspend setting: set to NEVER
Power Buttons and lid:
Power button action: Setting: set to shut down
Sleep Button Action: set to: do nothing
PCI Express:
Link State Power Management, Setting: OFF
Processor Power Management: Minimum state (set to) 7%

System Cooling Policy: setting: Active
Maximum State (set to) 100%
Display
Turn off display after: setting: NEVER (turning off display automatically can cause freezing also)
Turn off the monitor power manually, when you want it off. Don’t use the auto monitor turn off.
Multimedia Settings:
When Sharing Media: Setting: Prevent idling to sleep
When Playing Video: Setting: Optimize Video
Click APPLY
Click OK

Open the bios set up and make sure "cool and quiet" is OFF. (AMD)
If there is a power saver or a "quiet mode" in the bios, shut it off...
There may be a performance setting in the bios setup you have...make sure it's cranked up to max.
in the bios, see that the allocation for video, if available, is maxed.

Now open the hardware manager profiles...
click start
click computer
click system properties
click device manager
double click on mice and other pointing devices
right click on HID compliant mouse
left click on properties
click on the power management tab
UN-check the box that says: "allow the computer to turn off this device to save power." (there is now NO check mark in this box)
click OK

Now repeat this procedure for all mice, monitors, keyboards, and ALL USB ports on the device manager list.

You must open ALL the devices one at a time, as above, and turn off the power saver, for each device.

NOW turn all the security back ON. NOW open your security antivirus. Make sure the antivirus is set to "gaming mode." Or "multimedia mode."
This prevents the security updating from interrupting your game / multimedia priority.
IF the security does not have "gaming mode" or "multimedia mode" get different security.
IF you are using "free" security downloaded from the internet, get rid of it NOW.
Use ONLY professional all in one security. DO NOT load multiple mismatched security programs, which conflict with each other.
DO NOT load free tools into your system such as: "driver sweeper" or any of that "free" goofy stuff.