Big Problem

[some_o_ne]

hello first, i'm having a big problem with my notebook.
i have windows vista installed, but in the last time, sometimes, after logging in, windows 98 shows up and after restarting it's completely normal, vista shows up like nothing happened. i don't know why, it happened two times since i got it, but symantec antivirus and norton internet security, also antivirus, don't find anything, i googled it and i think it's a kind of wsh-virus (windows scripting host), but i just don't know how to delet it, because first i don't find any infected file and secondly i don't find a antivirus-program thats working

i actually don't exactly know what a wsh-virus is and how dangerous it can be

[mrintech]

Have a scan with: http://www.superantispyware.com/download.html and http://www.emsisoft.com/en/software/free . Also check out: http://www.threatfire.com/Download