Hi Gerry, and a belated welcome to the forums! Sorry that you have not received any response as yet. I'm afraid that "something failed" doesn't really tell us enough, so please try to describe the problem more fully if you have not already resolved it by now. Did you get any errors while installing Linux? Do you see a Linux "boot menu" when starting up, or does it go straight to the Linux desktop? If you have a boot menu, Linux would start by default after about 10 seconds, but there should be an entry for Windows which you would need to select by using the arrow keys and hit Enter.
I'm not too familiar with openSUSE, but I can load it up on a DVD/USB if needed, or I can set it up as a dual boot with Windows on another computer if it will help to retrace your steps to determine the failure. If you are still stuck in openSUSE only, please look to see if there is an application named "Disks" (or something like that) that shows you how your hard drive is partitioned. Another tool, if you have it or will install it, is called Gparted that will show this information. A screen capture that shows your hard drive layout/partitions would be very helpful, but we can also get this information by issuing some commands in a terminal.
The worst case will be if you allowed openSUSE to install to the entire disk, as that would have totally erased your Windows system. If Windows has not been erased (but is not available on the Linux boot menu I mentioned above)... then it may also be possible to start Windows by using the BIOS boot menu. This is usually activated by hitting some F-key at boot up, like F-10, or F-12, or possibly the ESC key too... this BIOS boot menu may show an option to boot Windows but it may be called something else, not quite so clear.
Let us know some other particulars too... which version of openSUSE did you install? We got Acer all-in-one desktop from your title (thanks!) but also give the exact model number for that. This probably won't matter, but sometimes a particular brand/model can have unique issues.
Cheers