System Tips

File opens wrong application.
assoc

Shows what programs open what file types
ftype{shows application path}

Need a deeper scan tool
DISM /Online /Cleanup-Image /Restore Health Deep repair tools
AND
DISM /Online /Cleanup-Image /startcomponentcleanup

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Hard drive doing the weird check out you drive
chkdsk /f Checks for file system errors.
chkdsk /f /r Checks for file system errors and repairs. You will reboot if you do the boot drive

Are deleted files are actually gone? Securely write over empty space on your drive.
cipher /w:c:

Disk Cleanup - Free up space on C: drive
cleanmgr

Show every driver and when it was installed. Drivers:
driverquery Using the "/v" extension will download the ones you do not have
then
driverquery /SI confirms that all drivers are installed and ready

Get MAC address
getmac Shows MAC address of local + remote machines

See your group policies! Shows every Group Policy applied to user and computer
gpresult /r

For admins: group policy update
gpupdate /force Force Group Police update

Show my DNS cache
ipconfig /displaydnsShows DNS cache

Is windows throttling your internet?
netsh interface tcp set global autotuning=high

See your wifi profiles. Shows all WiFi networks previous joined
netsh wlan show profiles |clip

Forgot your wifi password. Shows specific wifi network password in the clear
netsh wlan show profiles name=yourwifi key=clear

Is your app on internet? Shows which apps are talking to the internet and which ports they’re using.
netstat -abno |clip

What application is using what port
netstat -ano Shows ports + process IDs

For admins: silently access network users C drive
net use //computer/C$ {Use reverse slash}

User profiles that are configured Shows all users
net user

Change password on user.
net user existingUserName NewPassword The selected user will have his password updated.

Windows reliability monitor - your computers problem history {graphical}
perfmon /rel

Check battery on laptop
powercfg /batteryreport Creates battery health report

Unlock Ultimate Power Plan. Search "power plan" to see what you are currently using
powercfg -duplicatescheme e9a42b02-d5df-448d-aa00-03f14749eb61 Adds another performance item "Ultimate"

Windows depends on thousands of system files to function properly, and any of them can become corrupted due to bad updates, sudden shutdowns, or even malware. When that happens, you get vague symptoms such as apps crashing for no reason, Windows features stopping, or missing DLL errors.

The System File Checker (SFC) scans every protected system file on your machine and compares it against a cached copy. If something doesn't match, it automatically replaces the corrupted file. To run it, open Command Prompt as administrator, type sfc /scannow, and press Enter. The scan usually takes 10 to 15 minutes and needs no input from you once it starts.
sfc /scannow Repairs corrupt system files

Once it finishes, SFC reports one of three outcomes. It either shows no integrity violations found, corrupt files found and repaired, or corrupt files found, but not all could be fixed. If you get the third result, run DISM /Online /Cleanup-Image /RestoreHealth first. This pulls fresh copies of files from Windows Update, then run sfc /scannow again. It should succeed this time

Computer screwy Restarts PC directly into recovery menu.
shutdown /r /o

Force Windows shutdown
shutdown /s /t 0 Force shutdown immediately (works remotely)

Force Windows shutdown {IT gold}
shutdown /i Graphical remote shutdown manager (IT Gold)

Get system info
systeminfo /fo list

Shows just the OS information — filtered, clean, perfect for screenshots. {later windows}
systeminfo|findstr /B /C:”OS”

Got a resource hog. Shows how much resource an application is consuming.
tasklist /fi “imagename eq msedge.exe {Run ftype to get app names}

Replace task mangager detective work
tasklist /svc Shows what services and processes are running

07:18:27 – Kill frozen app and restart
taskkill /f /im explorer.exe & start explorer.exe Restart Windows Explorer example

Who am I?
whoami /groups Shows AD groups you’re in

Quick health check - Health check on hard drives or SSDs Reports OK if worky
wmic diskdrive get status

List of apps intalled on my system
wmic product get name

Update all applications. Updates all apps on your system, replacing chocolatey or manual updating
winget upgrade –all

It is time to test your ram chips
winsat mem