Was that a typo--"ybrowser"?
See the info in the link below for slow computer.
http://www.bleepingcomputer.com/forums/topic44694.htmlTo check for malware as the cause, use the two programs below.
Install Super Antispyware. Run it in safe mode. Allow it to quarantine whatever it finds.
http://www.superantispyware.com/Run the online scan for Bit Defender in normal mode. Allow it to quarantine whatever it finds.
http://www.bitdefender.com/scan8/ie.html--------------------------------------------------------------------------------