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Dell computer startup slow "the application is not responding..."
Hello. I've had a Dell desktop running Windows 10 for about 2-3 years. It has been running fine but for the last week or so, the startup boot speed has been a bit slow. Occasionally, I would get a message on the bottom left corner "the application is not responding. the program may respond again..." I can still move the cursor but it is a blue spinning circle and the rest of the scene is non-responsive (sometimes with a black screen). After 5-10 minutes, nothing changes and I'm forced to restart the computer. Afterwards, the computer would act as normal, although it is a bit slow.
I have the following startup items enabled during startup boots:
Media Check Tool (Sony corporation)
Catalyst Control Center
LauncherChormium (chrome.exe)
Waves MaxxAudio Service Application
Dell OSD Application
HD Audio Background Process (realtek)
Realek HD Audio Manager
Windows Defender Notification Icon
Which of these is safe to disable and which ones should I leave alone?
I have these startup items disabled on startup boots:
Corel Photo Downloader
Corel File Shell Monitor
Dropbox
iCloud Services
CCleanerMicrosoft
OneDrive
iTunesHelper
AvLaunch componet (AVAST Software)
McAffe Security Scanner Schedule
I have Avast anti-virus software installed. I did a "Smart Scan" and concluded that my PC had performance issues, For example, I have 26 "programs slowing down my PC and I need to safely put their background and startup services to sleep to boost speed". How do I put these apps to sleep since not all of these programs show up under the "Startup" tab?
Here are the listed programs from high risk to low risk:
Microsoft OneDrive
Microsoft Office 365
Realtek High Definition Audio Driver
Corel Paint Shop Pro
Dropbox
AMD Catalyst Install Manager
PlayMemories Home
iTunes
Dell Foundation Services
Dell Customer Connect
CyberLink Media Suite Essentials
Dell Product Registration
Bonjour
Qualcomm Atheros Bluetooth Suite (64)
Apple Mobile Device Support
Dell Digital Delivery
System Mechanic
Chormium
iCloudPluto TV
Mozilla Maintenance Service
Apple Software update
Ashampoo WinOptimizer free
McAfee Consumer Software Installation System
McAfee UI Container
UpdateLibary
I tried registry cleaning with CCleaner and have used other optimizing programs such as Ashampoo WinOptimizer, Malwarebytes, Adcleaner to clean up my computer. I also downloaded iolo System Mechanic freeware to determine my computer's status and it said it was good (green). There were no malware/viruses/junk files found, but my computer boot speed is still slower than it should be.
I also started to clean up some of my disk space (I currently have 289 GB free space and have 918 GB disk space total) I also defragmented my disk drive in hopes to speed up my computer. I did a quick analysis using the default disk defrag utility and it concluded that my disk drive is only 3% Defrag.
I also tried a system restore but it failed because I had a anti-virus program running. I've seen various topics about this issue on various sites/forums (including this one) but they haven't solved my problem. I can't figure out what is causing my computer to occasionally slow down.
Any ideals what could be wrong? Thanks.