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Hi Daniela1970,

Please download, install, update and run scans with the following free programs:

CCleaner:

http://www.ccleaner.com/ (No need to update this one.)

(Make sure you have the Windows>System>Memory Dumps option ticked: this will get rid of the MEMORY.DMP file.)

AVG Anti-spyware (requires Win2k/XP):

http://www.ewido.net/en/product/

a-Squared Free:

http://www.emsisoft.com/en/software/free/

Ad-Aware:

http://www.download.com/3000-2144-10045910.html

Spybot Search & Destroy:

http://www.safer-networking.org/en/download/index.html

When you have finished, follow these steps to remove infected System Restore points:

  1. Create a clean system Restore point:

http://www.bleepingcomputer.com/tutorials/tutorial56.html#manual

  1. Delete all previous System Restore points:

http://www.bleepingcomputer.com/tutorials/tutorial56.html#delete

If you still have problems with computer stability, try a registry scan with the trial version of TuneUp Utilitiies to check for registry errors:

http://www.tune-up.com/products/tuneup-utilities/

Good luck!