Boot time problem. Afraid to install Ubuntu !

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http://www.linuxforums.org – Hi, I have been using ubuntu alongside windows for many of these years right from 6.06 days. I installed ubuntu via Wubi. So the computer should boot and screen should show me the Boot options (Windows/ubuntu).Am i right ?? For the past 2 months, I have been facing this problem. When i boot, the first screen (lenovo screen ) comes up (usual) and the LCD screen goes black. The boot loader options are not shown, instead it just stays dark for a few mins and boots the default OS (Windows) directly. And then I get the windows logon screen directly.Not even the windows XP booting screen comes up. Till then the screen stays dark. I uninstalled ubuntu and I no longer get the problem. I can see the windows XP booting screen now. Only when i install ubuntu, i get this problem i guess. what may be the problem. I am afraid to install ubuntu and am afraid whether it will do some harm to my system. please help I want to use ubuntu but cannot afford to spend any money if it does any harm to my system. I want this problem to get solved. Please do help. (HowTos)