RAM and disk space are totally unrelated. So it's a mystery why you could install aol9.0 and antivirus after adding ram.
It's very uncommon, and I would definitely say dangerous for the health of your system, to have "mostly Windows 95 and some Windows ME". These OS'es weren't designed to be mixed up.
I'm inclined to say that the best thing to do is to format your hard disk (throwing away everything that's on it) and do a fresh install of Windows and all applications. That would cure both the full disk and the slowness and being kicked off Internet and undo any virus damage as bonus. Do you have a boot diskette and a OS CD? Which OS? Or maybe a recovery CD that came with the computer? Did you ever reinstall Windows?
Before doing this (with additional help from this forum, maybe) you can try to get Windows up more or less. Please tell current RAM and available space on disk. Simply type chkdsk c: (+ enter) at the c:-prompt (possibly, but I don't think so c:\windows\command\chkdsk c: ) and post back what it tells. I would advice to have at least 50 Mb free space on the disk to run Windows.
Unless you're good in MS-DOS and knowledgeable about what's on your system, I wouldn't do too much disc cleaning in MS-DOS. Only try to delete everything in c:\windows\temp by entering del c:\windows\temp\*.* (answer yes).
After those, tell exactly what happens if you type win to start windows. If you can get Windows up and running, you can use Explorer to delete much more files. Post again for advice on cleaning up your system.
I have had trouble with my computer being ever so slow and kicking off the internet. I bought more ram memory because I knew it was getting full and plan to send a day putting several files on Disk to free space but haven't had time - also figured there were some viruses. Could not download the aol virus protecton because of space - so I bought the memory. I loaded it and upgraded to 9.0 AOL and downloaded the virus protection. (some times it would scan others it would say not installed properly) I had tried to remove some of my files as well. Now the only thing it will do is come up to the c:\prompt I have some windows ME on but it is mostly Windows 95 - I put what I thought was the install disk and it will run a diagnostics on it and say all is well but will not start when I reboot. I have read everything on here for answers and ran scanreg and it has delcared clean and went to registry before trouble but still I get to the prompt and can find the magic key to open it. I am not very computer tech smart - I know few of the terms and only know that the memory was ram because the package said so. Is there hope?