I have Windows XP and I downloaded the version before QBASIC 4.5. The QBASIC folder containing QBASIC.exe is in the C:\ drive.

Here's my problem:
I want the window be the full scree3b and not a partial window, so I change the properties, but when I run the compiler, the resolution is very poor and you can see it "shaking" on the screen, as well as the resolution of the text fluctuates from time to time. On top of that, it runs pretty slow.

Environment:
Sony Vaio (not mine, just temporary) 2.66 GHz
466 MB SDRAM
40 GB HD

it shouldn't be slow with the power I have.