when i install professionel, that we just bougt,
ind cant use java, scripts, and the machine gets very slow, what have i done wrong
Welcome to the forums, rumagentspiff. 
While i do not use the Pro version od avast!, there are many here who do.
Hopefully, one of them will provide you with help very soon.
What OS do you have?
Have you had other antivirus program installed before avast, and if yes, how was it removed?
Do you have any other security programs installed? (like firewall, antispyware, other programs)
Why can’t you use JAVA, scripts, etc. what errors are displayed ?
If you disable the avast pro Script blocker, do they work ?
If they do work after disabling the script blocker it may be a conflict with another security application so Bluesman’s questions are important.