Issues with ubuntu 12.04 on dell inspiron 1545

[phi19]

Hey all, I'm new here
I've got two computers with a fresh install of Ubuntu 12.04:
- Acer Aspire One D270 netbook, Intel Atom processor, 2 gb ram
- Dell Inspiron 1545 notebook, Intel Core 2 duo processor, 3 gb ram

And I've got the EXACT same issues on both:
- every minute or so, the screen freezes for 3 or 4 seconds. I'm not able to do anything, and everything on the screen stays still. I'm only able to move the cursor, but nothing happens when I click on things.
- booting takes a long time compared to the times when I had ubuntu 10.10
- firefox freezes very randomly, the screen turns grey for a couple of seconds and then comes back to normal. It's very annoying, this didn't happen with 10.10

Any ideas? I don't have a clue

Thanks!

EDIT: I've got WUBI on both computers

[SThom27]

I realize this is a bit late, but I've got a Dell Inspiron 1545 with the same specs. Your problem is WUBI. If you're not just testing out Ubuntu, then never use WUBI.

Best idea? Partition 50-100 gb for Windows and Ubuntu. That's 50-100 gb a piece. Then partition the rest off for shared storage. You can even handle it from within Windows without needing to reinstall.

After that, everything works perfectly.

[gerrman97]

or reinstall from a liveCD/download a iso file and use unetbootin to put it on a flash drive. doesnt always work with unetbootin so be careful