[B]It Doesn't Matt'r If It's 64-Bit OR Not, All The Proccessors These Days Comes With 64-Bit Support, So It Shouldn't Be An Issue There.
I'm a Bit Surprissed With The Amount of RAM Installed, Though It's OK With Minimum Required Installed As 256MB, But I'd Suggest You Upgrade It With 1GB Minimum. With Droping Prices It Will Cost You Around Rs.1500-1800 With Brands Such As Tanscend & ZION. I've Done It With 256MB & It Took About 28 Min. To Load, So It Could Be.
I Doubt It's You Optical Drive (CD/DVD), Clean Up The Disc & Drive Tray. See If That Helps. Try Same Media With Other PC With Minimum Requirements Installed & See If It Works. If Does Well Than Try To Replace Your Optical Drive & Give It One More Shot. Good Luck.
Don't Forget To Share Your Experience.[/B]