Problem With Window Mode

PW is a game I like to play a lot, and I spend almost all day every day on it. I also like msn; it runs in the background. Since multitasking with Perfect world in Full Mode is annoying, I tend to have it in Window mode. When I try to set it into the 1024x768 mode, when a window comes up saying that it must be lower than my desktop resolution; While I've no idea what this means, my brother seems to have some suspicions. Now, this I don't mind; I simply put it as 800x600.

Before, I used to work on Patch 1 for Perfect World. It was slow, and as my computer was very old, I blamed the computer. 9 years old wouldn't make it run at high-speeds. There were problems such as logging in, and getting past the character select screen if that even worked; then the server was slow, as people still moved in the way they would, like NPCs and stretching as they do. However, neither on the mini map or in the window, they don't move their positions, nor do enemies. Then, suddenly, it will spring back into life during a fight and I'll have lost a lot of HP, or just died altogether. It's very annoying, though I had no idea how to deal with it. I was on a new computer at this point, which is still brand new, but the server continued to have these problems.

I switched to Patch 2 as my friend had suggested, and it was working very smoother and faster. So I decided Patch 2 works for my computer while Patch 1 doesn't. However, a problem immediately came around when I started using Patch 2: I've no idea what's to blame, whether it's something I might have done although I'm sure I did nothing, my computer maybe messed up, perhaps a fault in the Patch. Sometimes, Perfect World will exit on it's own when i have it in Window Mode. It won't have an icon in the bottom right corner, it will just completely close up, and a window will pop up. I took a screenshot here:

http://s168.photobucket.com/albums/u186/dog_girl_arf/?action=view&current=ReportBugs.png


Now, you might ask why I didn't use the window that popped up to report it; I did. I typed exactly what the problem was, in detail, I stated my username and In-game character's name. Even put my email in. The bottom part i had no idea about what it is for, so I just clicked Submit. After a few seconds, a small pop-up said it had Failed. A few seconds later after clicked "Ok" it said it had succeeded. I was confused, but just went on as if nothing was wrong.

This window won't always come up, but every now and then. My brother said that Windows Mode must **** it up, but to be honest I don't want to have to use Full mode. If anyone can help me, please get back to me asap.