A bad case of disappearing disk space

I have been noticing this for some time, but this laptop has become nearly un-usable at this point. I am running Vista. I have 30gGB with just 4.79GB free. In my properties I see that I have 503MB RAM. I have run Malwarebytes, it comes back clean. I have nothing running in my startup menu and have removed everything that is not necessary, that I can see. (pictures, music, programs...I'm pretty bare bones) I have no idea what else to do. It takes more than five minutes just to start up. Opening a browser window is a chore in patience, nevermind actually doing anything once it decides to grace me with it's presence. Downloading pictures, or anything else for that matter is a recipe for a frozen computer (downloads are generally limited to pictures and files from school). I'm at a loss! Could it be a virus that I just have not picked up? Any input would be forever appreciated!!

Thanks in advance,
Heathero

Hello ,well yes it may still be a virus. Let's try to do 2 scans

I'd like us to scan your machine with ESET OnlineScan

• Hold down Control and click on the following link to open ESET OnlineScan in a new window.
  ESET OnlineScan
• Click the button.
• For alternate browsers only: (Microsoft Internet Explorer users can skip these steps)
  • Click on to download the ESET Smart Installer. Save it to your desktop.
  • Double click on the icon on your desktop.
• Check
• Click the button.
• Accept any security warnings from your browser.
• Check
• Push the Start button.
• ESET will then download updates for itself, install itself, and begin scanning your computer. Please be patient as this can take some time.
• When the scan completes, push
• Push , and save the file to your desktop using a unique name, such as ESETScan. Include the contents of this report in your next reply.
• Push the button.
• Push

Now run this file cleaner.
Please download TFC by Old Timer and save it to your desktop.
alternate download link
Save any unsaved work. TFC will close ALL open programs including your browser!
Double-click on TFC.exe to run it. If you are using Vista, right-click on the file and choose Run As Administrator.
Click the Start button to begin the cleaning process and let it run uninterrupted to completion.
Important! If TFC prompts you to reboot, please do so immediately. If not prompted, manually reboot the machine anyway to ensure a complete clean.

Next scan with SAS... If you cannot access Safe Mode then run in normal but let me know.
Download and scan with SUPERAntiSpyware Free for Home Users

• Double-click SUPERAntiSpyware.exe and use the default settings for installation.
• An icon will be created on your desktop. Double-click that icon to launch the program.
• If asked to update the program definitions, click "Yes". If not, update the definitions before scanning by selecting "Check for Updates". (If you encounter any problems while downloading the updates, manually download them from here. Double-click on the hyperlink for Download Installer and save SASDEFINITIONS.EXE to your desktop. Then double-click on SASDEFINITIONS.EXE to install the definitions.)
• In the Main Menu, click the Preferences... button.
• Click the Scanning Control tab.
• Under Scanner Options make sure the following are checked (leave all others unchecked):
  • Close browsers before scanning.
  • Scan for tracking cookies.
  • Terminate memory threats before quarantining.
• Click the "Close" button to leave the control center screen.
• Back on the main screen, under "Scan for Harmful Software" click Scan your computer.
• On the left, make sure you check C:\Fixed Drive.
• On the right, under "Complete Scan", choose Perform Complete Scan.
• Click "Next" to start the scan. Please be patient while it scans your computer.
• After the scan is complete, a Scan Summary box will appear with potentially harmful items that were detected. Click "OK".
• Make sure everything has a checkmark next to it and click "Next".
• A notification will appear that "Quarantine and Removal is Complete". Click "OK" and then click the "Finish" button to return to the main menu.
• If asked if you want to reboot, click "Yes".
• To retrieve the removal information after reboot, launch SUPERAntispyware again.
  • Click Preferences, then click the Statistics/Logs tab.
  • Under Scanner Logs, double-click SUPERAntiSpyware Scan Log.
  • If there are several logs, click the current dated log and press View log. A text file will open in your default text editor.
  • Please copy and paste the Scan Log results in your next reply.
• Click Close to exit the program.