Crashing when fighting "bosses"

First post so sorry if i broke some rule.
Running V2.0 on, ahem, Vista.
The game runs absolutely flawlessly. Until i encounter a boss in their castle, and then the game instantly freezes.
It locks up when the message telling me what cards they start with pops up ("Astral Visionary has Zephyr Falcon!"), before the battle screen even starts up.
Anyone have any ideas? I encountered the problem once, went through and made sure there wasn't a problem with that bosses' deck, checked to make sure all the cards were spelled correctly, etc. Still nothing.
Then i went to go try a different boss (red) and the same thing happened. I played more than 100 matches prior to this happening, and there was never any freezing. I even went to go fight some other random encounters afterwards and it went fine.
Why would the game only be locking up when i fight a boss? I don't remember any videos before the match from when i used to play the game a decade ago, so what is different about these fights?
Running V2.0 on, ahem, Vista.
The game runs absolutely flawlessly. Until i encounter a boss in their castle, and then the game instantly freezes.
It locks up when the message telling me what cards they start with pops up ("Astral Visionary has Zephyr Falcon!"), before the battle screen even starts up.
Anyone have any ideas? I encountered the problem once, went through and made sure there wasn't a problem with that bosses' deck, checked to make sure all the cards were spelled correctly, etc. Still nothing.
Then i went to go try a different boss (red) and the same thing happened. I played more than 100 matches prior to this happening, and there was never any freezing. I even went to go fight some other random encounters afterwards and it went fine.
Why would the game only be locking up when i fight a boss? I don't remember any videos before the match from when i used to play the game a decade ago, so what is different about these fights?