I am a Mac Guy; know nothing about Windows…..

My Wife’s laptop is doing some STRANGE stuff:

* Takes up to 20 minutes to boot up
* Browsers are giving me annoying CERTIFICATE ACCEPTION errors on about 95% of the sites I try to visit
* Very slow performance in general
* Time & Date keeps jumping back to random dates like: 10/05/06, time changes as well

Will purchasing a good Registry Cleaner possibly resolve some/all of these issues?

Running Vista, laptop is only a year old.. Ran fine when purchased.

I cannot start Windows on my PC! I get an error message reading:

"Windows cannot start because "C:\WINDOWS\System32\config." is corrupted or missing. Insert original Setup CD-Rom and press ‘r’ at setup to begin repair."

I have looked at the software that I recieved when I got my computer (it was given to me by my neighbor two years ago), and I cannot find the original Setup CD-ROM, and I can’t get the others to run at all. I have gone to dell’s support website on another computer and tried their suggestions, which did not work. I tried the command-line string, but I can’t input anything. I’ve tried looking on here for solutions, and attempted what I found, but nothing’s worked so far.

Please help, it was working perfectly fine on Thursday evening, but on Friday, this problem began. I do not know what is causing it. To be able to get the best help, here are the details of my operating system:

Manufacturer: Dell
Edition: Windows Media Center Edition
Software Package: Microsoft Office Windows XP 2000
Year Manufactured (guesstimate): 2001
Virus/Malware/Spyware Protection Software: Avast!, Super AntiSpyware, Spybot: Search & Destroy, Ad-Aware.

I need to resolve this quickly, please. Any suggestions you may have will be tried, and are *very* welcome! Thank you very much to anyone who can help me!

My broadband speed is 2Mbps but my download speed rarely goes above 4 KBps(yes it’s "KBps"-kilobytes per second
not kbps) on downloading simple softwares from net. Can u help in some pc tweaks or a software which will speed up my broadband???
It took me more than half hour to download Google toolbar.This Yahoo! answers page itself took more than 13 mins to open in mozilla firefox with fasterfox extension. I have done defragmentation with Auslogics disk defrag, i have cleaned my registry and junk file also but nothin helps. my computer completely free of Viruses and spyware as I’ve scanned with NOD 32 Antivirus & SuperAntispyware and also Spyware doctor & cleaned all malware but still no change.

I am using windows XP pro, 512 RAM
It freezes during different points during startup & after awhile is would load without any windows services (ie. Help and Support, Wireless network connection)
I have reformatted the hard drive to reinstall windows xp, but it now freezes during the installation
Only things recently installed/cahnged: Registry cleaner installed & used and Party Poker

I would like to find a easy Registry clean as Im not a professional still finding my way around things. Can anyway suggest something thats good but easy to follow & also how can I teach myself on how to know which registry is right or wrong meaning if I need to delete something in the registry any ideas!. Also is it good to get a Registry clean for the computer? If not then I wont worry about it