hi im new and i have a big problem i have virus alert in system tray and dont have access to c drive and start up menu has been modify meaning dont hve access to alot of files i have windows xp can any one help me

Hi, can you use your computer to download files?
If not, then download the following to another computer and use a flashdrive/USB to transfer it to this computer.

Please download Malwarebytes' Anti-Malware to your desktop.

• Double-click mbam-setup.exe and follow the prompts to install the program.
• At the end, be sure a checkmark is placed next to
  • Update Malwarebytes' Anti-Malware
  • and Launch Malwarebytes' Anti-Malware
• then click Finish.
• If an update is found, it will download and install the latest version.
• Once the program has loaded, select Perform full scan, then click Scan.
• When the scan is complete, click OK, then Show Results to view the results.
• Be sure that everything is checked, and click Remove Selected.
• When MBA-M finishes, Notepad will open with the log. Please save it where you can find it easily. The log can also be opened by going to Start > All Programs > Malwarebytes' Anti-Malware > Logs > log-date.txt.

Please post this log in your reply.