Was about to try bitcoin payment on humble bundle. Didn't know what the "miner fee" part was all about so I was unsure if there would be any fee on my transaction. Went to options to see that my fee was at 0.000000000, pushed reset options. Went in options again because I didn't want to see the ui in my mother language. "Need to restart client until this option is in effect"... ok. I shut it down but didn't relaunch, instead I decided to update it to latest 0.8.6 (I had 0.8.5). After updating, I went into options again as it was in crappy language. Now it will always go into unresponsive-mode after pressing "ok"(even if I didn't change anything, apply greyed) or "apply", cancel works correctly. Giving it tens of minutes didn't work either, I press the "x" and windows wants to shut it down forcefully.

Stuff that doesn't work:
- Reinstalling latest version
- Uninstaller(or windows uninstall, same thing I guess)
- Deleting roaming\bitcoin (I have backup)
- Deleting everything "bitcoin"-related with regedit
- Restarting PC
- Trying installing with different user

Stuff that does work:
- Installing version 0.8.1 or older (0.8.2 or later doesn't seem to work)

I did notice that from 0.8.1 to 0.8.2 the installer-icon has changed : ) If that has to do with anything. So atm if I want to change any settings in options, I need to install 0.8.1 to change them, then install latest bitcoin-qt back. Otherwise it seems to work fine, it's finding peers and collecting data. But I don't even want to use this software for finance stuff as it's not working fully.

I have changed settings many times after 0.8.2 in the past, but for some reason after updating to 0.8.6 it doesn't work anymore. Using Windows 8.0.

How to fix?

[550e]

I got 6950(330Mh/s, replaced the 275gtx one), 275gtx(55Mh/s, in it's box), gaming pc, old pc with one pci-e x16(needs new psu). Only paying static fee for electricity, so it's practically free.

For some reason I have very hard time choosing one of these options:

1: Buy whole new pc insides 6950+6950 for mining rig,  275gtx for gaming pc = 550e
-- dual 6950 mining, 275gtx gaming/mining --

2: Buy 6990 for either gaming pc or old one(might not work?, will check if even 6950 works) and psu = 750e
-- 6950 mining/(gaming), 6990 mining/(gaming) -- prefer to use 6990 for mining.

3: Buy another 6950 for mining rig and psu = 290e
-- 6950 mining, 6950 gaming/mining --

4: Just buy psu for old pc = 50e
-- 6950 mining, 275gtx gaming/mining --

Annoyingly can't use directx11 while mining and also games drain mining speed a lot, ~25%+ gpu power lost to games over time.

Also not going to overclock as it would provide too much heat/noise. Not finding any dual fan 6990 thought, while I got 6950 with dual fan(with improved cooler) and it's very nice. Is there much difference between single and dual fan?

Is there any risk in any of those options? I'm not really a risk taker and most likely wont buy any more after this.