It depends on how much ram the old PC has. If it has at least 2GB you are good. Do not update If it has less or it will be as slow as hell. Make sure it has at least 50GB hard drive space too. I would recommend to update to XP though. It uses less that 1GB of RAM so it is not a good idea to upgrade it to win7.
Via Windows update
That is a large update, you will first want to be sure that the system that is running Win98 has the power to run Win 7. If so, then you need to pop in the Win 7 install disk and follow the on screen prompts.
yes is posible
What do you mean turn the window? Aero version of Alt-Tab? Win+Tab
Yes, you can. If you insert the DVD, it will start the dialog window for you. If you follow the instructions eventually it will as you whether you want to update the system or perform a new installation.
Press Win+Pause and look at very bottom of the the window. Or Win+R->type winver and press enter
Win+R->cmd-> Type in the cmd window: powercfg -h off
It does have you update to latest version of win7? and if that dosent work try a privet server or left click and select combatability mode and select win xp or win vista
you need a boot.wim image file from win 7 installation disk, or a Window PE
Yes
1 click on start menu 2 all programs 3 there you will find windows updates
Download the new java update and install. It should be Version 7 Update 7.