To be on the safe side i would run the pc in safe mode and scan for any virus,s and malware as this does also run chkdsk to correct any errors. also clear out all temp files and cookies by using cccleaner and this fails you can try run cmd.exe with administrative previlliges and type
netsh winsock reset
+restart
my advice is to use firefox not ie as i find firefox is alot safer and stable
PC MAN
November 2009