Here is a good list of tools you can use to troubleshoot/fix Windows. Though not a complete list it is a good start. Please feel free to add on to the list if you know of anything worth using. I tried to include only portable versions of the programs so you can keep them on USB keys. Anti-Virus Programs Avast Portable (http://www.pendriveapps.com/avast-virus-cleaner-virus-and-worm-removal-tool/) AVG Portable (http://www.pendriveapps.com/avg-anti-virus-rescue-usb/) Anti-Malware Programs SuperAntiSpyware Portable (http://www.superantispyware.com/portablescanner.html) Spybot Search and Destroy Portable [...]