Troubleshooting "not enough memory" error in UO Steam

Because the UO client only uses the first two mb of virtual memory, this along with UO Steam can prevent your client from opening if you have other programs open at the same time. Chrome is particularly bad for this, as is firefox and other browsers. If you receive a "not enough memory" error do not worry, just close out other opened programs and try launching UOSteam again.

UOS Windows 10 Fix A few UO Players have reported minor issues with Windows 10. Most have been easily overcome by running as administrator or my disabling the "Defender" anti-virus that comes standard in Windows 10

Windows Defender is included with Windows 10 and helps keep malware from infecting your PC, but can be annoying and block several UO Clients and Utilities like UO Razor and UO Steam

UOS Warning 
Please be aware that UO Steam is a third-party client/software and is not supported. Use the player-made macros and scripts at your own risk. Many of the amateur scripts that are being distributed have flaws and errors.

UO Steam Errors? Make sure that all of the programs that you use for UO are run in "Compatibility Mode" and "run as administrator". In a lot of cases that fixes the error you were receiving