How to Fix Error 1601 in Windows 7, Vista and XP?

You may experience an error “The Windows Installer service could not be accessed. Contact your support personnel to verify that the Windows Installer service is properly registered” while updating MS Office in your system. You would learn more about how to fix error 1601 and speed up pc in Windows 7, Vista and XP by following set of steps given below.

Try reregistering Installer files in registry:

Error 1601 can be due to broken registry keys of installer. Below are steps through which you can re-register installer files in the registry.

1. Press Windows Key + R or click on Run through Start

2. Type “msiexec /unreg” and press Enter.

3. Repeat step 1 & 2

Reregister rest portions of Installer files and revert registry damage.

You may use registry cleaning software in order to fix error 1606 in Windows7, Vista and XP.

1. Search for some reliable registry cleaner such as Reginout and download it.

2. Fix registry errors and reset your system.

Replace Corrupted System Files

You can use System File Checker to fix error 1601, follow the steps given below.

1. Insert Windows installation disk—Start > Run

2. Type “sfc /scanNow” without quotes and press Enter

Restore your computer:

Another way to solve error 1601 is to restore your computer to earlier date. Follow the steps given below.

1. Click on Start button.

2. All Programs > Accessories > System Tools > System Restore

3. Next and follow on screen instructions.

Restart Service and Download a Fresh Installer

Another way to fix error 1601 is to stop Installer service and re-start it. You can choose to download some reliable registry cleaner that includes services manager, otherwise follow the steps given below.

1. Click on Start > Run and type “ services.msc”

2. Enter.

3. Now right click on Windows Installer service to select Properties option.

4. From Startup type drop down box, select manual option.

5. Click Stop > Apply > OK

Instant Fix:

Download some reliable Registry Cleaner such as PC Fresher to fix Error 1601 and computer randomly restarts Problem.