api-ms-win-crt-runtime-l1-1-0.dll is missing

Hello Alan, I’m a volunteer on this site.

This error is usually cause by the missing Visual C++ Redistributable for Visual Studio 2015 on your Windows. You can solve the problem through installing the software.

Here is two ways for you to install Visual C++ Redistributable for Visual Studio 2015. Choose any one you prefer.

1. Install the software via Windows update

2. Download Visual C++ Redistributable for Visual Studio 2015 from Microsoft directly https://www.microsoft.com/en-in/download/detail...

Thank you again but already tried thpse, i think i may have a cmputer peoblem

rather than software problem might have to seek from a shop 

Thank you again for your help, im running windows 8.1 at the moment but have been advised by a local computer shop that upgrading to windows 10 will solve the problem. Im not too keen on the idea as when the free upgrade was out I got windows 10 & had all sorts of problems with printers, hard drives & software not working properley & i done a factory reset to go back to 8.1 & the computer's never been the same since!  im led to believe that a lot of those kind of problems have been ironed out, hope that's right because at the moment it doesnt look like i have much choice.

 Thank you again for trying....Alan

Hopefully Windows 10 will fix the problem you’re having. You could always use disc imaging software like Macrium reflect to backup your 8.1 before updating to 10 then if it doesn’t fix the problem or you experience other problems you can quickly return to 8.1.
It is unfortunately true that upgrades to Windows can make other hardware & software incompatible.

Just thought I'd let you know the problem has been solved following a conversation with an I T guy at work. After describing to him how I restore the computer too factory settings he asked me what I do next. The computer had on it a free trial of Office 365 & Macafee, I would un install those then,thinking I'm doing the sensible thing I would run 'CC Cleaner' 

 This appears to be the problem.

 I've reapeated the steps to restore the computer again but this time without running CC Cleaner. Now both ITunes and Windows Update are running perfecty. Seems to me that CC cleaner is either to abrasive or for some reason it just doesn't agree with my computer. Hopefully you might be able to advise someone else with the same problem in the future. Once again thank you for your help & hope this proves to be some use to somebody else...Alan