try system restore(if on) prior to date of errors occuring, if not...
then try checking msconfig utility> startup for any spyware and disable, check all programs>startup folder, and disable, try turning off system restore temporarly, start in safe mode , scan again with adaware and virus scan, empty temp folders, using regedit -search for related files found by scans earlier,but could not delete in normal mode, cmd.exe lc,gt, mt, et cetera...,