Screen Freeze, yet game function in background

kurisukotze

So here is my long story short

I returned to pwi after few months break, and got new pc old graphics card and this happen game screen frozen like screen shot but if i click/use skills I hear it, if I minimize and bring it back I got black screen and can still hear skills etc. It recovered once after 20mins of minimizing but only once. So I got new graphics card updated all drivers and played around with settings but it still happens at random sometimes once a day sometimes 3 times per hour, I run win7 cuz I like living in the past, I run 2 clients in window mode, sad thing is even does it with single client.

I checked searched forums and found old threads didn't help much, unless i missed something.

Please help as it happened in UP and kinda annoying keeping squad waiting. Thank you in advance!