cpu is at 100%

you should first off see what is loaded in your backround.. things loading in your startup might be hogging up all your resources. What OS do you have?? i would hit ctrl.alt.del to see what programs are running in the backround. another thing youcan do is use the msconfig.exe ran from a run prompt. this utility can help you identify what memory resident applications that are loading when you os boots. If you are more specific as to what os you have i will be able to tell you exactly how to stop this and prevent this from happening in the future...

Scan your machine for viruses.

Many processes start up "invisibly" when windows starts. The only way to see them is to check what processes are running in the background. In win2k, hitting the ctrl+alt+delete keys simultaneously, then picking task manager will show you what processes are running and how much cpu time they are using. (You can also hit ctrl+shift+esc, or start:run and type 'taskmgr')
In windows 98 you need a 3rd party utility to view processes. Check here:
http://www.google.com/search?q=%22process+viewer%22+%2Bfree

When you find the culprit, determine whether or not it is necessary to have running. If the purpose of the process is not immediately apparent, look it up here:
http://www.pacs-portal.co.uk/startup_content.htm

It may be listed there,as well as whether or not it is critical to system operation. While you are there, check the other processes to see if they are needed or just sucking up resources.

I wish you luck, I hope I've been a help.

o-o-o

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