Older programs not compatible with Windows 7‏ or above

Not all, but some older programs may not work in Windows 7 or Windows 8 or above. Desktop applications and software written for Windows Vista should work for Windows 7 as well but some older programs might  have compatibility issues. Before installing the software/programs, we need to check whether it is compatible with the Windows version you are using.  You might encounter an error while running programs which are not compatible for Windows 7 or others:

 Now we talk about what could be reason behind old programs not working in Windows 7. Programs designed for older versions of windows like Windows 98, Windows 2000, Windows XP or Windows Vista are tested for compatibility with these version and are not tested for future release of Windows operating systems like Windows 7 or so, we are not sure if they are going to work for newer release of Windows. However, when a newer versions of Operating system is released, this has been taken care most of the time so that older versions should work, depending on the class (or type) of device, many hardware devices need a new Windows 7 specific driver to function properly on Microsoft's latest operating system. It also depends on your operating system architecture, for an example if you are using Windows 7 64-bit and trying to install a program which is built for 32-bit motherboard, it will error out. Also, you get some options to run your software with different compatibility modes:

Let's talk about how can try to make incompatible software work in Windows 7.  User following steps to run your program in Windows 7.

Right click on the program(exe file/setup file), click on properties, click on compatibility tab and follow the instructions below, once you make change any of these properties, try running the software:
Compatibility mode: Runs the program using settings from a previous version of Windows. Try this setting if you know the program is designed for Windows 7 version of Windows.
Reduced color mode: Uses a limited set of colors in the program. Some older programs are designed to use fewer colors.
Run in 640 × 480 screen resolution: Try this setting if the graphics for the program appear jagged or are rendered improperly.
Disable display scaling on high DPI settings: Turns off automatic resizing of programs if large font sizes are used. Try this setting if large-scale fonts are interfering with the appearance of the program.
Run this program as an administrator: Some programs require administrator privileges to run properly. If you aren't signed in to your Windows 7 PC as an administrator, this option is unavailable.
Change settings for all users: Lets you choose settings that will apply to all users on your Windows 7.

You can also try running program compatibility troubleshooter in Windows 7 as below:
Run the Program Compatibility Troubleshooter: Open the Program Compatibility troubleshooter by clicking the Start button in Windows 7, and then clicking Control Panel. In the search box, type troubleshooter, and then click Troubleshooting. Under Programs, click Run programs made for previous versions of Windows.

Workaround: Blue screen error Windows 7

Description:
It is also called "STOP Error" or "Blue screen of death"(BSOD), windows will display a message "A problem has been detected and windows has been shutdown to prevent damage to your computer".
The error screen may show different error codes as per the issue. Windows automatically creates a “minidump” file that contains information about the crash and saves it to your disk. You can view information about these minidumps to help identify the cause of the blue screen. The error is not much helpful in investigating the issue.

Cause:
This error could cause due to following reasons:
1. Due to any hardware,software or device driver issue
2. Any recent hardware/software changes made to the system
3. Critical OS data has become corrupted
4. Windows is not able to recover from it without losing data
5. System may running out of memory

Troubleshooting:
There are following solutions could be followed in order to troubleshoot the problem:
Use System Restore: If your system recently started blue-screening, use System Restore to roll its system software back to a previous state. If this works, you’ll know that it’s likely a software problem.
Scan for Malware: This could also be due to any system critical file affected by Malware. Scan your computer for malware to ensure if any malicious software causing it to crash.
Install Updated Drivers: An incorrectly installed driver can lead to crashes. Download the latest drivers for your computer’s hardware from your computer manufacturer’s website and install them — this may fix BSODs caused by driver problems.
Boot Into Safe Mode: If your computer is blue-screening every time you turn it on, try booting into safe mode. In safe mode, Windows loads only the essential drivers. If a driver you’ve installed is causing Windows to blue screen, it shouldn’t do so in safe mode. You can work on fixing the problem from safe mode. Also, check if the system is not running out of memory or the system has enough space in its windows drive.
Run DiskCheck: Run chkdsk by going to the Safe Mode and typing "chkdsk" in command prompt in order to determine any disk errors if there is any.
Check for Hardware Problems: Blue screens can be caused by faulty hardware in your computer. Try testing your computer’s memory for errors and checking its temperature to ensure that it isn’t overheating. Also, you can check your system hardware in order to make sure if everything is plugged in correctly like hard disk, RAM etc and there are no hardware connectivity issues. Replace any faulty hardware if detected.
Reinstall Windows: Reinstalling Windows is the last option. It will remove/uninstall all your existing system software and other device drivers.

Warnings: Backup your data to an external drive in Safe Mode before restoring last known good configuration or running repair diagnostics. Do not edit the registry or the start-up programs without technical assistance or how-to.

Quick fix: The VPN client is unable to establish a connection (Cisco Anyconnect)

This is due to Internet Connection Sharing services running and might have conflicts with Cisco Annyconnect VPN. Follow below steps below to resolve the issue:

1. Go to Task Manager
2. Select Services tab
3. Click on open services
4. Right click on Internet Connection Services(ICS)
5. Click on stop

Now try again it you should be able to connect to VPN.