I don't know how to solve this, it's the only thing stopping me from installing Linux on my machine. I can't find an answer online. I have Win7 64 bit installed and 50GB of free HD space.
Thanks in advance.
That's an unusual error - I've installed countless distro's on MBR formatted disks without issue. What disk are you trying to install to?
The primary disk. It's the only one I have so I'm trying to dual boot. Would I need to format the disk for Linux or is it something else?
I meant make, model, and capacity. SDA is almost always the primary disk. Linux likes EXT partitions, particularly EXT4, but it doesn't sound like a partitioning issue - it sounds like a formatting issue. Linux likes both MBR and GPT, so I don't see why it would ask for a GPT only.
Is it possible to get a screen shot/picture of the issue?
Yup, it's something else. Your disk is spiked with a payload, it's the same for many MBR drives that had Windows on them. They need a detox treatment. It's always better to reformat your drive. NTFS sucks balls, it's slow and inefficient, and has no modern features. You're MUCH better off with a linux filesystem, ext4 if you're conservative and just want performance, but I'd give btrfs a try, I kinda like the features, and on the better distros (read: anything but Ubuntu based distros), it's stable. It has good performance and a lot of really cool features.
Do not, I repeat, DO NOT, install Windows and linux on the same physical drive. If you do that, you're in for a world of hurt, believe me. You're better off buying a small SSD for linux or something, you can have decent 128 GB MLC drives from SanDisk for as little as 60 EUR these days, and although those drives aren't speed freaks and have a plastic housing, they work just fine, except for encryption, because they have SandForce controllers, which use compression for speeding up the drive, and that has an adverse effect on the performance of encrypted drives. If you really want something good for linux and you're going to use full disk encryption, buy a Samsung SSD, which has hardware level encryption and a much better controller, and you can even use the F2FS filesystem, and open source filesystem specifically made for flash memory developed by Samsung for linux. Downside is that Samsung knows that they make the best consumer/SOHO SSD's, and they are pretty expensive, but if you buy at the right time, you can still get a nice promotion price under 90 EUR for a 120 GB TLC EVO.
120 GB is more than enough for linux, and linux can store to your NTFS Windows infected drive no problem, and doesn't load the Windows malware payload.
If you have a smaller budget than that, just buy a USB 3.0 memory stick, a good one that can stand a lot of cycles (I always use Lexar myself, it's what I have had the best experiences with for years). A 16 GB superspeed USB3.0 thumbdrive costs only a few bucks, and it's more than enough to install Linux on. A 32 GB or 64 GB stick would be better and faster, but they are a bit more expensive. Use a modern distro with those, you need the extra USB 3.0 performance of kernel 3.14 and now 3.15, which is even faster.
If you don't have a USB 3.0 controller, another option is to use a high speed CompactFlash card into a PCMCIA slot, that's also nice and speedy, or even faster, you could use PCI express.
If that's not an option, a fast USB 2.0 stick will work just fine on a tight budget. I run a lot of live distros for various purposes, mostly on USB 2.0 and USB 3.0 thumbdrives, and it's fast enough with the right distro to still get a pleasant experience.
OK, I think I'll get an SSD so(I wanted to get one anyway, now I have an excuse). Thank you for the help. I'll just use a live version of Sabayon. Thanks again
Thanks for the help, but I'd say Zoltan's solution is just easier. But really, thank you for trying to help me.