|#1 may relate to #3. MS SE may have noted that it is spyware/malware I doubt you need them but see if you can do a uninstall of it from add and remove.|
#2 If empty don't worry about it. Citrix is for professional companies. If you are at home then might use attrib from command line in that directory to see if really empty.
#3 is more useful that you can imagine. You would be wise to keep it or use a good competing software.
There are tons of reasons for running slow. Too little of ram, parts going out, too many applications in memory and many other reasons can cause it. Things like installing and uninstalling a lot of software might cause it. Not all uninstallers work correctly.
I doubt the ISP speed has much to do with anything other than downloading large files or maybe using video.. I HOPE this isn't what you mean by running slow. If so disregard the forth paragraph.
Playing to the angels
Les Paul (1915-2009)