Is it possible to set Spysweeper so it won't scan the c:\Windows\installer directory? Then you might be able to complete a scan.
Also, there is a difference between RAM and hard drive space. You say " I have 2.00 gb of ram but only have 320mb available", but your total hard drive space would come from the properties of your C:\ drive, and have nothing to do with the amount of RAM you have.
If you have a virus, however, it's possible that it's causing other issues on your PC. If you're having issues with this virus continually being identified, however, you may want to post in our Malware Forum for additional help.
Please go here
and follow the instructions for downloading and running hijackthis. Post your log here.
Explain in your post that you're unable to complete any scans, and what virus is being identified. One of our Malware helpers will come along and help you out.