I just checked my Windows 7 directory -- 26 GB!
Pastor Paul -- I just checked the sized of my Windows directory (upgraded from Vista 64-bit to Windows 7 64-bit Home Premium) and found it to be 26 GB. That's about 1/2 of your total SSD size! If you have any programs besides Windows, you will take up more space; my Program Files (x86) contains another 10 GB and I don't run that many different programs. It's likely that your Virtual Memory (VM) is set too high for the amount of disk that remains. For instance, if you set the VM to use 20 GB and you only have 15 GB remaining, you will get the warning messages, even if your programs don't really use all of the space. Use Explorer to see how much disk space you have left and set the VM maximum to maybe half or two-thirds that. If you have a lot of RAM, you shouldn't need much VM in normal operation. Windows will figure out how to use what VM you give it, even if it isn't a lot.
Many systems come with lots of trial and basic level software; not everyone gets rid of this, especially when they re-install the OS and immediately gift the system to a new home. Go to the Control Panel -> Programs and Features and Uninstall any programs that you aren't going to use, such as trial offers of security programs, basic multimedia editing and authoring (I'm guessing here, since you were willing to accept a disk with only 60 GB), business productivity, games, etc. This will free up more disk space for uses that you really want.
Just because Win 7 thinks that something isn't compatible, it doesn't mean that it won't work. You should go ahead and install your program in Win 7 and then Run it in the XP Compatible Mode -- i.e. don't try the Install program in the XP Compatible Mode (I bumped into this once, so I know not to install using the XP Compatible Mode). It's also worth a little trial-and-error with the compatibility settings before giving up on your program. I installed some things that Win 7 didn't think were compatible and they seem to be fine so far. Also, since you aren't the only one who ever purchased the program, you should check online with a search engine for help. I managed to get a 10 year old Sony PDA (long gone from the market) to work with Win 7, SP1 64-bit by finding some help like that.
As wpgwpg mentioned, other Windows settings also have a bearing on your disk usage. Minimizing the size of the Recycle Bin, System Restore, browser and media viewer caches, etc. can also help you maintain more SSD for your usage. This is also true for any programs that offer auto backup while editing -- auto saving two dozen drafts for each document can eat up the disk space.
I agree with turning off as many of the startup programs as you can. They take up RAM and generally do little, especially with an SSD. Often there are small programs that speed up launches of larger programs, such as Adobe Reader, that are useful with slow hard drives but completely unnecessary with SSD. Also, turn off auto updates for programs, such as Adobe Reader, because they also install small programs that take up RAM while doing little. You can manually update whenever you like, and by doing this, you will save RAM (and VM) space; you just have to remember to do this, like once a week, or just before you exit a program when you complete your task. I have most of my programs to check for updates but to download manually; this can also be a good compromise if you don't want to remember to do it, as it usually doesn't run the full download & install package so it still keeps your RAM usage low.
Best of luck to you!
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