I was having problems using Moneysoft on my main Windows 8.1 computer (specifically I couldn't email payslips). Moneysoft support couldn't help as it worked on their 8.1 computer. I got round the problem by using my spare Windows 8.1 computer to email payslips which was obviously inconvenient as I had to back up and restore my payroll data in order to do this.
I then found that my main Windows computer was getting slower and slower and started freezing every 4 hours or so. I was advised to perform a PC Refresh which is a new feature in Windows 8/8.1, I did this last weekend and my main computer is now running just like it did when it was new. I can also now also email payslips from Moneysoft.
The downside of doing a PC Refresh is that although all my documents were unaffected, I had to reload all my programs (Sage, Moneysoft, Microsoft Office etc), all my browsers and printer drivers etc, , so it look several hours to do. However, it was well worth it for me as I was tempted to buy a new computer but I do not need to now.