Memory problem, but there is enough space - virus? pls help!

Since yesterday I am unable to download anyfile, I always get a message saying that there is not enough free disk space, but I happen to have 3GB space still left. I can't save any textedit document, it takes forever to reboot and when I connect my usb external harddrive it is not recognized. moreover skype refuses to start. The internet also got slower and when I have more windows open the task manager shows up and asks me to close down some applications. Strange thing I refused to update last week when the message poped up and when I opened the update today it said that there was nothing to upadate.
What is happening? Is it a RAM problem? or have I got a virus on the board? I really need to work on my computer and seems to me, that I can't eve backup now. I am very grateful for any suggestions.

Your Mac needs adequate hard drive space to operate normally. How full can a drive be before it's too full? There is no hard and fast rule that says “X” amount or “%” of free drive space is needed. A low amount of RAM requires more drive space for Virtual Memory’s swap files. As a general rule, your available space should be 5GB as an absolute minimum as it generally requires that much free space to perform an Archive and Install of Mac OS X and still preserve some free space for VM swap files. How much RAM do you have? With only 3GB of free space, you may have corrupted some of the files on your hard drive.
Problems from insufficient RAM and free hard disk space are discussed in this link
http://www.thexlab.com/faqs/lackofram.html
Look at these links.
Freeing space on your Mac OS X startup disk
http://www.thexlab.com/faqs/freeingspace.html
Amazing Disappearing Drive Space
http://www.pinkmutant.com/articles/TigerMisc.html
Increase HD Free Space[/b] by using Monolingual 
http://monolingual.sourceforge.net/
How to free up my disk space
http://www.macmaps.com/diskfull.html
Where Did My Disk Space Go?
http://www.macfixitforums.com/ubbthreads.php/ubb/showflat/Number/770243/site_id/ 1
 Cheers, Tom

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