What are the specs of your machine?
I experienced those problems with both a Pentium D 3GHz and an Atom D330 1,6GHz system. Both were only running with 1 GB of ram, and both did not have this issue when fitted with 2GB of RAM, but in fairness I have switched a lot between Windows7 and Linux Distro's on those machines so I do not know if that extra GB fixed it.
AMD E2-1800 APU 1.7 GHz. 4 GB RAM.
Question: Why does the program need much of the processor/RAM?
I did not find anything like
"Add file from URL..." in your client, usually under "File"
in my wallet program.
Anyway, I do not own many BLK and do not want to go too much into detail, I will just exchange the BLK in some other altcoin and probably forget the problem. If some blackcoin supporter wants to solve the problem, go ahead... I thought the system and the black halo wallet (or whatever it is) was interesting, too, but had problems with the program (64 bit version), too. So probably, I give up and turn to one of the 10000 other altcoins...
Thanks