Virus/spyware problem....

hi all,

iam using symantec antivirus 2007 edtion in my computer, the virus definitaions are updated & full system scan has done. but still my system afected with spywares. when ever i open browser some other web site's are opening. it's showing w32.Myzor.FK@yf is a virus it's infected with .exe files . anybody can u please let me know full version removal tool or anti spyware software for this issue