windows live mail 2012 deletion problem in windows 7 but not windows 10

Yesteray I decided to download windows 10 and did so without difficulty,but 10 takes me almost 3 minutes to start all the programs,icons etc. from the time I push the start button on my computer until the program icons appear on my computer. This is unaccepatable to me  and possibly the time could be reduced at the msconfig level deleting or disabling various apps,services etc. But I would have to take this to my techie and his time costs..  I therefore switched back to windows 7  and my startup time is less than a minute.  Anyway in windows 10, live mail worked fine and I could delete any messages without a window appearing saying an error has ocurred and it could not be performed.  On reinstalling  live mail on windows 7  I started having these deletion problems  as I have in the past. This is extremely frustrating as I have done repairs, reinstalling without any success.   I see that windows 7 live mail has had many problems in the past which have not been corrected by your co..  Otherwise  I like live e-mail mail 2012 the way I can set up folders  and its general configuration,but have been looking at Mozilla<s thunderbird e-mail client but it lacks many features of your program. What is going on with your e-mail program in windows 7?  What is the permanent fix for this!  Thanks and I hope you can help.