Windows 7 - Dual Monitors Problem

Well when i use both monitors it gets all blurry like this,
http://i33.tinypic.com/23hk1m0.png
But when i use one monitor it doesn't.
why is this??

Interesting. I was writing the obligatory "that's gotta be hardware" response when I realised the PNG was probably a screenshot (?). In other words, the screenshot "saw" the corruption.

Are you running the latest video driver?

For my computer?

Yes. Is your computer using the newest available (software) video driver for its (hardware) video card?

Also, can you confirm how you generated that screenshot?

I held fn then hit Prt sc.
Also could it be because i was running 32 bit vista then installed Windows 7 64 bit.

Since a "screenshot" is a dump of raw video memory (to a file), the fact that the screenshot shows the corruption suggests a possible driver problem. You should check what driver you're currently using, and if necessary update it to the latest available version for your computer's video card.

Otherwise, if this was some sort of hardware or electrical interference issue, the screenshot would likely look perfect - the corruption would only be visible on the screen(s).

It has nothing to do with the fact that you used to run 32-bit Vista. 32-bit and 64-bit drivers are completely different. It is literally impossible for a 32-bit video driver to be accidentally used with 64-bit Windows.

Well it was using 32bit now its running 64bit.
& How could i check the drivers?

Knowing what hardware you have would help. If unsure this should tell you waht is what,

SIW | System Information for Windows by Gabriel Topala

We know he's on a Laptop at least :P

I run a Lenovo X200, up to date Intel drivers and have same issue, but only on dual monitor extend desktop display. Turning off Aero solves problem. Graphics card performance or driver flaws may be culprit.