Can i install parallels with fusion on my machine?

I have a mini-mac about 2 years old and vmware fusion. Mavericks on the mac and window xp run by fusion. Ever since the beginning of installing fusion and running window I have had nothing but headaches, freeze ups and when it did work correctly ... windoz was super-duper-ultra slow. (read as "unusable")
I am thinking about trying parrellells... can i try it while fusion is on the machine?

Thanks
K

I did a "restore point" and got windows working again ... although slow (but not as slow as before).

I plan to stick with windoz xp, even though windoz 7 seems pretty good., mainly because i do not want to reinstall everything all over again.
As far as your windoz 10 idea, I usually wait about 3 years till the bugs are out.

Frankly I am getting tired of spending money for software to do a hundred extra things I will never use AND probably even more importantly, wasting precious time to learn how to use all these supossedly "user friendly" features. (And that means both windows and apple).

Thanks
K