So I've installed 11.1 and have a few issues I need some help with...thanks in advance!!!

1. Everything seems to run really slow--eg, it takes 4 seconds to open system settings and I know my machine is old, but not that old...lol.
2. Software Center is blank
3. Firefox is also blank when opened
(these remain blank even after reboot)
actually everything seems to be blank, even a document, system settings remains ok

Again, thanks for the help!