Can I check if somebody uses my computer while I'm not at office ?

You could use a keyboard logger! But beware of spyware, so be careful where you get one from! If its your PC why not just lock it unless you have to share! You can even set a PW in BIOS, but there are ways around that. Also, depending on your O/S and your access level you may be able to see at a basic level who has logged in as profiles will have been created under C:\Documents and Settings At least this stands for win 2k ! In saying all that does it matter as long as others are not using your logon/ profile etc! Jabba

You could also check your Event Viewer for logons and logoffs.

go to "control panel> administrative Tools> Event Viewer and check the logs. they will have a record of system activities and the times at which they occured. You could also check internet explorer temp files. Open IE, go the Tools> internet options> settings> view files. If they haven't cleared the cache there will be lots of files with time/date/info. If you have a web cam you could leave it on and access it from another pc and possibly find out who the perpetrator is. check the power settings in the control panel so the pc won't hybernate if you decide to try the cam trick. If you are computer savvy you could have the cam activate if someone uses your pc and alert you via e-mail/messenger. If you have a tv out on your video card you could also record to a vcr. Am I getting carried away?? Hey this spy stuff can be fun! doug