Extremely slow boot up, logon, and response to commands after logon.

[Jim Pivonka]

This Dell desktop is suddenly extremely slow on boot, logon response, and input command response. The problem first manifested when the computer was restarted when I returned after a 36 hour absence. Before leaving I had exited all programs, and used "Start" to shut it down. I did not stay to watch it complete the shutdown cycle and turn itself off, however. It may have attempted and failed a massive MS imposed update, including the huge DotNet update, as the shutdown was on the 21st of October.
After I left, and unexpected, and unexpectedly severe weather front came through. The computer is connected to the internet via a wireless broadband connection, which is much slower than a DSL or cable connection, though generally satisfactory. It does take a while to complete very large downloads, however.
About the computer:
Dell Inc. Inspiron 537s 00
System Service Tag: xx (support )
Chassis Serial Number: xx
Enclosure Type: Desktop
2.60 gigahertz Intel Pentium Dual-Core
64 kilobyte primary memory cache
2048 kilobyte secondary memory cache
64-bit ready
Multi-core (2 total)
Not hyper-threaded
Board: Dell Inc. 0U880P A01
Serial Number: ..CN750939AB02D0.
Bus Clock: 200 megahertz
BIOS: Dell Inc. A03 07/23/2009
500.00 Gigabytes Usable Hard Drive Capacity
343.44 Gigabytes Hard Drive Free Space
Windows 7 Home Premium (x64) Service Pack 1 (build 7601)
Install Language: English (United States)
System Locale: English (United States)
Installed: 12/25/2009 5:35:41 PM
Intel(R) G41 Express Chipset [Display adapter]
DELL ST2420L [Monitor] (24.0"vis, s/n XX-04X6C0-XXXXX-09F-2AMU, September 2010)
Microsoft Security Essentials Version 4.8.0204.0
Scan Engine Version 1.1.12205.0
Virus Definitions Version 10/24/2015 Rev 1.209.384.0
Last Disk Scan on Tuesday, October 20, 2015 1:09:48 AM
Realtime File Scanning On
Ad-Aware Antivirus
Missing Security Updates new – for Adobe, Apple, Java, Microsoft and more [Back to Top]

Hotfixes from Microsoft Update (agent version 7.6.7601.19016) install automatically.
Last install: 10/21/2015 4:06:38 AM, download: 10/20/2015 6:29:55 PM, check: 10/24/2015 12:34:30 PM.

These security updates apply to this computer but are not currently installed (using Advisor definitions version 2015.10.21.3), according to the 10/13/2015 Microsoft Security Bulletin Summary and bulletins from other vendors. Note: Security benchmarks require that Critical and Important severity security updates must be installed.

Hotfix Id Severity Description (click to see security bulletin)
APSB15-24 Critical Adobe Reader security update for Reader 11.0.12.18
CpuOct2015-2367953 Critical Oracle Java SE Critical Patch Update for Java 8.0.45.14 32-bit

I hope that satisfies requirements for system info.

I've been wrestling this problem for about 20 hours now, except for sleep time. No change. If I were less patient, I'd think it was broken; boot "loading Windows" message is on screen about 80 minutes before the logon screen is presented. After logon is completed the "Welcome" screen is on about 50 minutes before presenting the desktop. Control Alt Delete returns fail messages unless all other processes have completed, and then takes about 10 minutes to return the Task Manager screen.
However, the cursor is responsive to the mouse. The system is not responsive to mouse and cursor input, except very slowly.
Who can tell me what I might do to repair this situation?

 

[hang-the-9]

Run the sfc /scannow command https://support.microsoft.com/en-us/kb/929833
Reboot, run a disk check, select to fix errors, reboot and let it run.
After that run a defragmentation on the hard drive.

If that does not help, you may need to try a new Windows setup or even replace the hard drive.