as you say you have apparently got NO protection on there it might be a sensible idea to do some scans to see the state of play in that area and see if an infection might BE the cause of your problems ?
as you say you do not have ANY anitvirus program installed , can you also confirm if you have an anitvirus protection within your internet connection?
assuming you have NO
anitvirus protection you could try
the FREE avg7.5http://www.filehippo.com/download_avg_antivirus/
you will need to install it , update the definitions which may take a few attempts,reboot into safe mode and run a full computer scan
may I also suggest you run some scans to see what if anything they find?
try super antispyware FREE for home usershttp://www.superantispyware.com/superantis...efreevspro.html
its exe is http://www.superantispyware.com/downloadfi...ANTISPYWAREFREE
and asquared also FREE http://www.emsisoft.com/en/software/free/
its exe is http://download6.emsisoft.com/a2FreeSetup.exe
you will need to download each fully update the definitions , reboot preferably into safe mode and run a full deep scan with each
they will each produce a log report for you to post back on here for the team to review
you could also try an on line scan from Trend http://housecall.trendmicro.com/uk/
Didn't get any updates
by this do you mean you have NOT been to the Microsoft windows update site to check for any updates you need?