Firstly, I decided to download some partition software. A few of these are free, and will allow you to expand a system volume, unlike disk manager within your operating system. This was where the problems started. The partition software that is free is 32bit only, and will screw your whole computer up if you run it on a 64bit operating system. After reading far too much on the subject, I decided to find a torrent with Euseus Partition manager Pro on it, as it supported 64bit. Now this is not free, and I was looking to try before you buy!
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Instant virus (These fed boys know what they are doing!). It ravaged my PC in instantly, with the process tree hitting the hundreds in seconds. It froze the virus killer and added processes quicker than I could delete them. Considerably quicker! Within seconds I did a hard shut down, and booted up my second install of WinXP Pro. From there I ran every virus killer I could get my hands on, till finally I got enough positive finds to satisfy I had cleared it. Then it dawned on me. I was in a 32bit operating system, with access to the same drive volumes, and the 32bit Euseus software was free..
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Well, here I am, with a lovely big system C:\, with plenty of space for some bad implementation of software redundancy by MS. The virus is dead, and I have won - hurrah.
Soo, If you want to increase your system volume for free, and you have a dual install with a 32bit operating system, you are now in luck
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Edit*** When you get your Win7 64 copy, you also get the Win7 32bit disc. If you don't want to buy partition software, dual boot with the 32bit operating system, and use the free software, as I did above. Beware Acronis Disk Director as there are posts throughout the net with disasters on 64bit systems. Make sure you only run the EASEUS Partition Master Home Edition (Free) on a 32bit operating system, as it will kill your Windows 64 install! You can use the in-built disk manager to increase C:\, but you will have to delete the entire volume/partition next to it. As this was FULL of important stuff, that was of no use to me. You cannot move the unallocated space in the disk manager tool, so shrinking the other volume will create the space on the right of the drive/partition you have reduced. This means C:\ cannot expand into it, and that option will remain grayed out.